Docs: Add missing `@deprecated` tags in the file docblock of some deprecated files.

Props jrf.
Fixes #48254.
Built from https://develop.svn.wordpress.org/trunk@46439


git-svn-id: https://core.svn.wordpress.org/trunk@46237 1a063a9b-81f0-0310-95a4-ce76da25c4cd