Twenty Thirteen: update code comments to reflect WP inline docs standards. Props DrewAPicture, see #25256.

git-svn-id: https://develop.svn.wordpress.org/trunk@25522 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: remove `rem` units, props iamtakashi. Fixes #25366.

git-svn-id: https://develop.svn.wordpress.org/trunk@25523 602fd350-edb4-49c9-b593-d223f7449a82