Add pg_upgrade to docs (#31)

Co-authored-by: susan-pgedge <[email protected]>

Author: mason-sharp

README.md

@@ -8,6 +8,7 @@ lolor is an extension that makes Postgres' Large Objects compatible with Logical
 - [Basic Configuration](README.md#configuring-lolor)
 - [Using lolor](docs/using_lolor.md)
 - [Limitations](README.md#limitations)
+- [Using pg_upgrade with lolor](docs/pg_upgrade_with_lolor.md)
 - [Release Notes](docs/lolor_release_notes.md)
 
 PostgreSQL supports large objects as related chunks as described in the [pg_largeobject](https://www.postgresql.org/docs/current/catalog-pg-largeobject.html) table. Large objects provide stream-style access to user data stored in a special large-object structure in the catalog. Large objects stored in catalog tables require special handling during replication; the lolor extension allows for the storage of large objects in non-catalog tables, aiding in replication of large objects.

docs/pg_upgrade_with_lolor.md

@@ -0,0 +1,27 @@
+# Using pg_upgrade with lolor
+
+The `pg_upgrade` utility is used for upgrading Postgres versions.
+
+You can use `pg_upgrade` with the `lolor` extension installed provided that you are using lolor version 1.2.2 or later. If you are using an older version of lolor, you will need to upgrade the extension first.
+
+Before running `pg_upgrade`, you must disable `lolor`. After executing pg_upgrade, you can enable lolor.  Use `psql` or another client to disable lolor:
+
+```
+db1_17=# SELECT lolor.disable();
+```
+
+Next, execute the upgrade. A sample `pg_ugrade` command appears below:
+
+```
+# pg_upgrade --old-datadir=/data/db1_17 \
+		--new-datadir=/data/db1_18 \
+		--old-bindir=/usr/lib/postgresql/17/bin \
+		--new-bindir=/usr/lib/postgresql/18/bin \
+		--link
+```
+
+Then, use psql to enable `lolor`:
+
+```
+db1_18=# SELECT lolor.enable();
+```

mkdocs.yml

@@ -52,4 +52,5 @@ nav:
   - lolor Overview: index.md
   - Building and Installing lolor: install_configure.md
   - Using lolor: using_lolor.md
-  - lolor Release Notes: lolor_release_notes.md
+  - Using pg_upgrade with lolor: pg_upgrade_with_lolor.md
+  - lolor Release Notes: lolor_release_notes.md