Ensure the `register` filter hook is only documented once.

See #26869.


git-svn-id: https://develop.svn.wordpress.org/trunk@28208 602fd350-edb4-49c9-b593-d223f7449a82
Ensure the `style_loader_tag` filter hook is only documented once.

See #26869.


git-svn-id: https://develop.svn.wordpress.org/trunk@28209 602fd350-edb4-49c9-b593-d223f7449a82