Twenty Fourteen: first pass at adding help text to to "Help" tab for `edit.php` and `themes.php` screens. Props obenland for starter patch, see #25837.

git-svn-id: https://develop.svn.wordpress.org/trunk@26153 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: fix tabs to spaces in two files. See #25946.

git-svn-id: https://develop.svn.wordpress.org/trunk@26154 602fd350-edb4-49c9-b593-d223f7449a82