Twenty Fourteen: fix a display issue in screen sizes over 846 pixels where a post's featured image covers the post meta of the post above.

Props kraftbj and obenland, fixes #28649.
Built from https://develop.svn.wordpress.org/trunk@29101


git-svn-id: http://core.svn.wordpress.org/trunk@28887 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add missing filter doc, see [29043].

see #27627.
Built from https://develop.svn.wordpress.org/trunk@29102


git-svn-id: http://core.svn.wordpress.org/trunk@28888 1a063a9b-81f0-0310-95a4-ce76da25c4cd