Fix broken links in transfer.md

[CriszelGipala]

Changes:

• Fix 11 broken documentation links: typos (docs.source to docs/source), incorrect filenames (system-connection-* to system-* ), and outdated references to renamed/removed commands (generate kube, play kube, manifest subcommands).

Why:

• Multiple links in the Docker-to-Podman command mapping table lead to non-existent pages, making it harder for new users to find the correct documentation.

Scope: transfer.md only - no code changes.

Checklist

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• Certify you wrote the patch or otherwise have the right to pass it on as an open-source patch by signing all
  commits. (git commit -s). (If needed, use git commit -s --amend). The author email must match
  the sign-off email address. See CONTRIBUTING.md
  for more information.
• Referenced issues using Fixes: #00000 in commit message (if applicable)
• Tests have been added/updated (or no tests are needed)
• Documentation has been updated (or no documentation changes are needed)
• All commits pass make validatepr (format/lint checks)
• Release note entered in the section below (or None if no user-facing changes)

Does this PR introduce a user-facing change?

[Honny1]

Thanks for the changes. I found several broken links, and it seems some of the fixes broke lists that were previously working.

[Honny1]

Thanks, last two nits.

[Honny1]

LGTM, just one last thing: squash your commits. Thanks

[packit-as-a-service]

[NON-BLOCKING] Packit jobs failed. @containers/packit-build please check. Everyone else, feel free to ignore.

[Honny1]

LGTM