PXC-4910 Fix code blocks and update documentation 8.4

[patrickbirch]

modified:   docs/add-node.md
modified:   docs/apparmor.md
modified:   docs/apt.md
modified:   docs/bootstrap.md
modified:   docs/certification.md
modified:   docs/clone-sst.md
modified:   docs/compile.md
modified:   docs/configure-cluster-rhel.md
modified:   docs/configure-cluster-ubuntu.md
modified:   docs/configure-nodes.md
modified:   docs/crash-recovery.md
modified:   docs/data-at-rest-encryption.md
modified:   docs/docker-compose.md
modified:   docs/docker.md
modified:   docs/encrypt-traffic.md
modified:   docs/faq.md
modified:   docs/garbd-howto.md
modified:   docs/gcache-record-set-cache-difference.md
modified:   docs/gcache-write-set-cache-encryption.md
modified:   docs/glossary.md
modified:   docs/haproxy.md
modified:   docs/high-availability.md
modified:   docs/intro.md
modified:   docs/limitation.md
modified:   docs/load-balance-proxysql.md
modified:   docs/quickstart-overview.md
modified:   docs/secure-network.md
modified:   docs/security-index.md
modified:   docs/selinux.md
modified:   docs/set-up-3nodes-ec2.md
modified:   docs/singlebox.md
modified:   docs/state-snapshot-transfer.md
modified:   docs/strict-mode.md
modified:   docs/tarball.md
modified:   docs/telemetry.md
modified:   docs/upgrade-backup.md
modified:   docs/upgrade-guide.md
modified:   docs/upgrade-packages.md
modified:   docs/verify-replication.md
modified:   docs/virtual-sandbox.md
modified:   docs/wsrep-files-index.md
modified:   docs/wsrep-provider-index.md
modified:   docs/wsrep-status-index.md
modified:   docs/wsrep-system-index.md
modified:   docs/xtrabackup-sst.md
modified:   docs/yum.md

[github-actions]

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🚫 [linkspector] _{reported by reviewdog 🐶}
Cannot reach https://dev.mysql.com/doc/refman/{{vers}}/en/server-system-variables.html#sysvar_log_output. Status: 404

pxc-docs/docs/strict-mode.md

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This validation checks the value of the [log_output :octicons-link-external-16:](https://dev.mysql.com/doc/refman/{{vers}}/en/server-system-variables.html#sysvar_log_output) variable.

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Cannot reach https://dev.mysql.com/doc/refman/{{vers}}/en/innodb-parameters.html#sysvar_innodb_autoinc_lock_mode. Status: 404

pxc-docs/docs/strict-mode.md

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This validation checks the value of the [innodb_autoinc_lock_mode :octicons-link-external-16:](https://dev.mysql.com/doc/refman/{{vers}}/en/innodb-parameters.html#sysvar_innodb_autoinc_lock_mode) variable.

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Cannot reach https://docs.percona.com/percona-xtrabackup/{{vers}}/reduction-in-locks.html. Status: 404

pxc-docs/docs/state-snapshot-transfer.md

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Starting with Percona XtraDB Cluster 8.4.7-7, the `xtrabackup` SST method uses the [Reduced backup lock time :octicons-link-external-16:](https://docs.percona.com/percona-xtrabackup/{{vers}}/reduction-in-locks.html) feature. This enhancement minimizes blocking on the **Donor node** during SST process while the backup is being prepared. The Percona XtraBackup reduced lock feature is enabled by default. To modify this behavior, set the desired `lock_ddl` value in the [xtrabackup] section of the `my.cnf` configuration file. For more information about the `--lock-ddl` option and its available values, refer to the [xtrabackup command-line options :octicons-link-external-16:](https://docs.percona.com/percona-xtrabackup/{{vers}}/xtrabackup-option-reference.html#lock-ddl) documentation.

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Cannot reach https://docs.percona.com/percona-xtrabackup/{{vers}}/xtrabackup-option-reference.html#lock-ddl. Status: 404

pxc-docs/docs/state-snapshot-transfer.md

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Starting with Percona XtraDB Cluster 8.4.7-7, the `xtrabackup` SST method uses the [Reduced backup lock time :octicons-link-external-16:](https://docs.percona.com/percona-xtrabackup/{{vers}}/reduction-in-locks.html) feature. This enhancement minimizes blocking on the **Donor node** during SST process while the backup is being prepared. The Percona XtraBackup reduced lock feature is enabled by default. To modify this behavior, set the desired `lock_ddl` value in the [xtrabackup] section of the `my.cnf` configuration file. For more information about the `--lock-ddl` option and its available values, refer to the [xtrabackup command-line options :octicons-link-external-16:](https://docs.percona.com/percona-xtrabackup/{{vers}}/xtrabackup-option-reference.html#lock-ddl) documentation.

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Cannot reach https://docs.percona.com/percona-server/{{vers}}/backup-locks.html. Status: 404

pxc-docs/docs/state-snapshot-transfer.md

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The least blocking method leverages [backup locks :octicons-link-external-16:](https://docs.percona.com/percona-server/{{vers}}/backup-locks.html).

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Cannot reach https://docs.percona.com/percona-server/{{vers}}/selinux.html. Status: 404

pxc-docs/docs/selinux.md

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For more information, see [Percona Server and SELinux :octicons-link-external-16:](https://docs.percona.com/percona-server/{{vers}}/selinux.html)

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Cannot reach https://docs.percona.com/percona-server/{{vers}}/selinux.html. Status: 404

pxc-docs/docs/selinux.md

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Modifications described in [Percona Server and SELinux :octicons-link-external-16:](https://docs.percona.com/percona-server/{{vers}}/selinux.html) can also be applied for *Percona XtraDB Cluster*.

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Cannot reach https://docs.percona.com/percona-server/{{vers}}/data-at-rest-encryption.html. Status: 404

pxc-docs/docs/security-index.md

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| Data-at-rest encryption | Percona XtraDB Cluster supports tablespace encryption to provide at-rest encryption for physical tablespace data files. For more information, see [Percona Server for MySQL Data at Rest Encryption :octicons-link-external-16:](https://docs.percona.com/percona-server/{{vers}}/data-at-rest-encryption.html). |

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Cannot reach https://docs.percona.com/percona-xtradb-cluster/{{vers}}/install/index.html. Status: 404

pxc-docs/docs/quickstart-overview.md

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Install [Percona Server for MySQL :octicons-link-external-16:](https://docs.percona.com/percona-xtradb-cluster/{{vers}}/install/index.html).

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Cannot reach https://docs.percona.com/percona-xtrabackup/{{vers}}/installation.html. Status: 404

pxc-docs/docs/quickstart-overview.md

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Install [Percona XtraBackup :octicons-link-external-16:](https://docs.percona.com/percona-xtrabackup/{{vers}}/installation.html)

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Cannot reach https://dev.mysql.com/doc/refman/{{vers}}/en/replication-options-binary-log.html#option_mysqld_log-bin. Status: 404

pxc-docs/docs/limitation.md

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* [log_bin :octicons-link-external-16:](https://dev.mysql.com/doc/refman/{{vers}}/en/replication-options-binary-log.html#option_mysqld_log-bin)

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Cannot reach https://docs.percona.com/percona-server/{{vers}}/use-keyring-vault-component.html. Status: 404

pxc-docs/docs/data-at-rest-encryption.md

Line 109 in f9cac90

Configuration options are the same as [Percona Server for MySQL :octicons-link-external-16:](https://docs.percona.com/percona-server/{{vers}}/use-keyring-vault-component.html).

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Cannot reach https://dev.mysql.com/doc/refman/{{vers}}/en/server-system-variables.html#sysvar_default_storage_engine. Status: 404

pxc-docs/docs/configure-nodes.md

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[`default_storage_engine` :octicons-link-external-16:](https://dev.mysql.com/doc/refman/{{vers}}/en/server-system-variables.html#sysvar_default_storage_engine)

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Cannot reach https://dev.mysql.com/doc/refman/{{vers}}/en/innodb-parameters.html#sysvar_innodb_autoinc_lock_mode. Status: 404

pxc-docs/docs/configure-nodes.md

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[`innodb_autoinc_lock_mode` :octicons-link-external-16:](https://dev.mysql.com/doc/refman/{{vers}}/en/innodb-parameters.html#sysvar_innodb_autoinc_lock_mode)

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Cannot reach https://docs.percona.com/percona-xtrabackup/{{vers}}/privileges.html. Status: 404

pxc-docs/docs/configure-cluster-ubuntu.md

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set up a new user with proper [privileges](https://docs.percona.com/percona-xtrabackup/{{vers}}/privileges.html):

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Cannot reach https://docs.percona.com/percona-server/{{vers}}/clone-plugin.html. Status: 404

pxc-docs/docs/clone-sst.md

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Clone limitations are described in [Clone plugin limitations :octicons-link-external-16:](https://docs.percona.com/percona-server/{{vers}}/clone-plugin.html)