Inline documentation for hooks in wp-admin/includes/plugin.php

See #25229 props dllh

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git-svn-id: http://core.svn.wordpress.org/trunk@25395 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/class-wp-admin-bar.php

See #25229 props betzster

Built from https://develop.svn.wordpress.org/trunk@25475


git-svn-id: http://core.svn.wordpress.org/trunk@25396 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clean up the documentation for add_filter and apply_filters.

Fixes #19203 props DrewAPicture, ericlewis

Built from https://develop.svn.wordpress.org/trunk@25476


git-svn-id: http://core.svn.wordpress.org/trunk@25397 1a063a9b-81f0-0310-95a4-ce76da25c4cd