docs: revert playbook streaming branch to main (DOC-2222) (#610)

PR #608 merged with local-antora-playbook.yml still pointing the
`documentation` (streaming) component at the docs PR branch
`doc-2222-cloud-cmc-default-topic-props`. That branch was deleted when
redpanda-data/docs#1728 merged, so cloud-docs main now references a
non-existent branch and builds/deploy previews will fail to fetch it.

The docs change is now on main, so restore the standard branch list and
remove the temporary override comment.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: micheleRP

local-antora-playbook.yml

@@ -14,11 +14,8 @@ content:
   sources:
   - url: .
     branches: HEAD
-  # TEMPORARY (DOC-2222): pull the streaming component from the docs PR branch
-  # (redpanda-data/docs#1728) instead of main so the deploy preview renders the
-  # three customer-managed Cloud properties. REVERT to `main` before merging.
   - url: https://github.com/redpanda-data/documentation
-    branches: [doc-2222-cloud-cmc-default-topic-props, v/*, shared, site-search]
+    branches: [main, v/*, shared, site-search]
   - url: https://github.com/redpanda-data/docs-site
     branches: [main]
     start_paths: [home, data-platform, self-managed]