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