Add phpdoc for $attr argument of wp_get_attachment_image(). props GaryJ. fixes #23791.

git-svn-id: https://core.svn.wordpress.org/trunk@23714 1a063a9b-81f0-0310-95a4-ce76da25c4cd
POT, generated from r23713

git-svn-id: https://core.svn.wordpress.org/trunk@23715 1a063a9b-81f0-0310-95a4-ce76da25c4cd