Docs: Correct duplicate hook references in various files.

This commit adjusts cross-reference comments where the hook was moved to a different file but the cross-reference was not updated.

Props apermo, mukesh27.
See #64224.

git-svn-id: https://develop.svn.wordpress.org/trunk@61878 602fd350-edb4-49c9-b593-d223f7449a82