ci: point playbook at docs PR branch for preview

Temporarily override the docs repo branch to
fix/remove-token-examples-from-cloud-gbac so the Netlify
deploy preview shows the Cloud GBAC pages without the
token structure examples section.

⚠️ Revert before merge.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: micheleRP

local-antora-playbook.yml

@@ -15,7 +15,7 @@ content:
   - url: .
     branches: HEAD
   - url: https://github.com/redpanda-data/documentation
-    branches: [main, v/*, shared, site-search]
+    branches: [fix/remove-token-examples-from-cloud-gbac, v/*, shared, site-search]
   - url: https://github.com/redpanda-data/docs-site
     branches: [main]
     start_paths: [home]