[ci/docs] Add doc maintainer to CODEOWNERs for doc (#24778)
[ci/docs] Add doc maintainer to CODEOWNERs for doc (#24778)

e2ee214 broke linter on master. However, reverting the commit or hotfixing the docs requires codeowner approval. It makes sense to include @maxpumperla as a codeowner in doc-related code paths, so this PR adds him.
ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray