Doc fixes for wp_get_network().

props TobiasBg.
see #27003.

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git-svn-id: http://core.svn.wordpress.org/trunk@27230 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: Add 'Return to post editor' link.

props adamsilverstein, jenmylo.
fixes #24682.

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git-svn-id: http://core.svn.wordpress.org/trunk@27231 1a063a9b-81f0-0310-95a4-ce76da25c4cd
"At a Glance" widget: Move `get_avatar()` line out of if-block.

This allows you to show avatars for custom comment types via the `get_avatar_comment_types` filter.

props zodiac1978.
fixes #26944.
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git-svn-id: http://core.svn.wordpress.org/trunk@27232 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update PHPMailer to 5.2.7 from 5.2.4.

Includes two trivial modifications for WordPress:
 * Doesn't use the autoloader, so the check to enforce the autoloader from the constructor is removed.
 * Requires class-smtp.php for backwards compatibility with direct (non-wp_mail()) uses of PHPMailer, as the autoloader isn't used.

props bpetty.
fixes #25560.

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git-svn-id: http://core.svn.wordpress.org/trunk@27233 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add the ability to short-circuit wp_nav_menu() via the `pre_wp_nav_menu` hook. props kasparsd, DrewAPicture, Rarst. fixes #23627.

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