Improve inline documentation for `WP_Users_List_Table`.

Props leewillis77 for the initial patch.
Fixes #26564.


git-svn-id: https://develop.svn.wordpress.org/trunk@27301 602fd350-edb4-49c9-b593-d223f7449a82
Introduce HTML5 gallery support.

When a theme supports HTML5 galleries via add_theme_support( 'html5', 'gallery' ), figure and figcaption will be used instead of definition list markup.

props obenland.
fixes #26697.


git-svn-id: https://develop.svn.wordpress.org/trunk@27302 602fd350-edb4-49c9-b593-d223f7449a82