Fix incomplete inline documentation for the `wp_header_image_attachment_metadata` filter.

See #26869.

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git-svn-id: http://core.svn.wordpress.org/trunk@28203 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clarify documentation for *what* gets "automatically fired" when the `do_mu_upgrade` filter evaluates to true in Multisite.

See #26869.

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git-svn-id: http://core.svn.wordpress.org/trunk@28204 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add a complete short description to the `get_attached_media` filter documentation.

See #26869.

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git-svn-id: http://core.svn.wordpress.org/trunk@28205 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use a proper docs-specific variable for the first parameter passed to the `embed_oembed_discover` filter.

See #26869.

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git-svn-id: http://core.svn.wordpress.org/trunk@28206 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate use of `extract()` in `wp_get_archives()`. 

Adds unit tests: `tests/functions/getArchives.php`. 
All other unit tests pass.

Props MikeHansenMe, wonderboymusic.
See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28207 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix a phpdoc typo and multi-line comment syntax in wp-cron.php.

Props rclations.
Fixes #28231.

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git-svn-id: http://core.svn.wordpress.org/trunk@28208 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate use of `extract()` in `wp-includes/theme-compat/comments-popup.php`. 

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28209 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate use of `extract()` in `trackback_url_list()`. 

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28210 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate use of `extract()` in `the_title_attribute()`. 

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28211 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate use of `extract()` in `Custom_Image_Header::step_2()`. 

See #22400.

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git-svn-id: http://core.svn.wordpress.org/trunk@28212 1a063a9b-81f0-0310-95a4-ce76da25c4cd