fix: restore cloud-docs branch to main in local-antora-playbook.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Feediver1

local-antora-playbook.yml

@@ -18,7 +18,7 @@ content:
   - url: https://github.com/redpanda-data/docs
     branches: [v/*, shared, site-search,'!v-end-of-life/*']
   - url: https://github.com/redpanda-data/cloud-docs
-    branches: DOC-1812-Document-Cloud-Feature-Schema-Registry-Contexts-Serverless-etc
+    branches: main
   - url: https://github.com/redpanda-data/redpanda-labs
     branches: main
     start_paths: [docs,'*/docs']