Also, replace the generic `.alignright` class with a more specific class to avoid styling issues with themes which have padding/margin attached to `.alignright`. Props azaozz, imath. Fixes #36461. Built from https://develop.svn.wordpress.org/trunk@37174 git-svn-id: http://core.svn.wordpress.org/trunk@37141 1a063a9b-81f0-0310-95a4-ce76da25c4cd