Inline documentation fixes for `wp_heartbeat_set_suspension()`.

See #25073.


git-svn-id: https://develop.svn.wordpress.org/trunk@26732 602fd350-edb4-49c9-b593-d223f7449a82
Ensure that disabled select elements are distinguishable from normal ones. Fixes #26456, props TobiasBg.



git-svn-id: https://develop.svn.wordpress.org/trunk@26733 602fd350-edb4-49c9-b593-d223f7449a82