Rename `_wp_password_hint()` to `_wp_get_password_hint()` to bring it inline with core terminology. Fixes #21243.

git-svn-id: https://develop.svn.wordpress.org/trunk@30033 602fd350-edb4-49c9-b593-d223f7449a82
Add a missing asterisk in the DocBlock for `write_post()`.

Also removes several `@uses` tags, which are no longer leveraged as part of the inline documentation standard.

Props tareq1988.
Fixes #30118.


git-svn-id: https://develop.svn.wordpress.org/trunk@30034 602fd350-edb4-49c9-b593-d223f7449a82