Inline documentation for get_comment_reply_link() and 'comment_reply_link' filter.

props DrewAPicture.
fixes #25310.
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Inline documentation for hooks in wp-includes/author-template.php.

props Frank Klein.
see #25229.
Built from https://develop.svn.wordpress.org/trunk@25429


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* Avoid notices in `tests/ajax/Autosave` by bailing early when `get_post()` returns nothing.
* Check for the existence of `$_POST['catslist']` before using it in `wp_ajax_autosave()`.

See #25282.


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git-svn-id: http://core.svn.wordpress.org/trunk@25354 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix some undefined index notices related to Comment unit tests:
* There are several places where a `$_POST` index was unchecked before setting a variable
* In `wp_notify_postauthor()`, `$comment` was being returned null, but its properties were being accessed.
* In `check_ajax_referer()`, 3 different values can be checked for nonce on `$_REQUEST`, but only 1 had an `isset()`

See #25282.


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git-svn-id: http://core.svn.wordpress.org/trunk@25355 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/comment.php.

props mordauk.
see #25229.
Built from https://develop.svn.wordpress.org/trunk@25434


git-svn-id: http://core.svn.wordpress.org/trunk@25356 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/export.php.

props mordauk.
see #25229.
Built from https://develop.svn.wordpress.org/trunk@25435


git-svn-id: http://core.svn.wordpress.org/trunk@25357 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Account for Windows and CLI instances in wp_guess_url(). Props SergeyBiryukov. See #25317

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