This change introduces the `wp_get_update_php_annotation()` function, which returns the message displayed when a host filters the direct PHP update or PHP update education URLs to indicate the information is site specific and provided by the host, not WordPress core.
It also updates `wp_update_php_annotation()` to accept a `$before` and `$after` parameter, which makes this notice more flexible for displaying in multiple locations within the admin area. Previously, the markup output in `wp_update_php_annotation()` was hardcoded, which was making it difficult to display it properly in multiple locations.
Props afragen, aaroncampbell, flixos90, TimothyBlynJacobs, desrosj.
Fixes#46044.
git-svn-id: https://develop.svn.wordpress.org/trunk@44935 602fd350-edb4-49c9-b593-d223f7449a82
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