Twenty Eleven: remove buggy `word-break` property, use `word-wrap` instead,...

Twenty Eleven: remove buggy `word-break` property, use `word-wrap` instead, for better hyphenation and word breaking in nested comments. Fixes #22751.


git-svn-id: https://core.svn.wordpress.org/trunk@23060 1a063a9b-81f0-0310-95a4-ce76da25c4cd