Extra white space in diviner

Test Plan:
Go to http://phabricator.com/docs/phabricator/article/Adding_New_CSS_and_JS.html
Text after examples should not be preformatted

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1275