No need for wp_get_password_hint() to be prefixed as if it is private.

see #21243.

Built from https://develop.svn.wordpress.org/trunk@30855


git-svn-id: http://core.svn.wordpress.org/trunk@30845 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Rename _wp_clear_update_cache() to wp_clean_update_cache().

This makes it match most cache-clearing functions, including the ones it wraps. Also no need for it to be prefixed as "private."

wp_clean_plugins_cache() doesn't always exist, so as a quick fix, clear the transient we care to clear.

see #30369.

Built from https://develop.svn.wordpress.org/trunk@30856


git-svn-id: http://core.svn.wordpress.org/trunk@30846 1a063a9b-81f0-0310-95a4-ce76da25c4cd