Add a complete short description to the `get_attached_media` filter documentation.

See #26869.


git-svn-id: https://develop.svn.wordpress.org/trunk@28377 602fd350-edb4-49c9-b593-d223f7449a82
Use a proper docs-specific variable for the first parameter passed to the `embed_oembed_discover` filter.

See #26869.


git-svn-id: https://develop.svn.wordpress.org/trunk@28378 602fd350-edb4-49c9-b593-d223f7449a82
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.


git-svn-id: https://develop.svn.wordpress.org/trunk@28379 602fd350-edb4-49c9-b593-d223f7449a82