DFW: don't block the "keyup" event, fixes toggling the checkbox in the Link dialog with the spacebar. Fixes #25934.
Built from https://develop.svn.wordpress.org/trunk@26649


git-svn-id: http://core.svn.wordpress.org/trunk@26539 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Two more hook docs fixes.

`image_memory_limit` filter:
* Go with int|string on the limit, and simply notate '256M' as an acceptable string value.

`wp_editor_set_quality` filter:
* Add a missing parameter description for the mime type.

See #25721.

Built from https://develop.svn.wordpress.org/trunk@26650


git-svn-id: http://core.svn.wordpress.org/trunk@26540 1a063a9b-81f0-0310-95a4-ce76da25c4cd