Fix style for <h4> element in comments section.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1528140 13f79535-47bb-0310-9956-ffa450edef68
Replace tab with spaces

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1528141 13f79535-47bb-0310-9956-ffa450edef68