General inline documentation improvements in wp-includes/functions.php.

Final run. Fixes #26185.

Built from https://develop.svn.wordpress.org/trunk@29011


git-svn-id: http://core.svn.wordpress.org/trunk@28799 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add phpDoc blocks for two `WP_oEmbed` methods added in [28846].

Fixes #28284.

Built from https://develop.svn.wordpress.org/trunk@29012


git-svn-id: http://core.svn.wordpress.org/trunk@28800 1a063a9b-81f0-0310-95a4-ce76da25c4cd