Add directive name, so that quickreference.xsl can extract default value correctly.

Always align on the left code in <highlight> block in order to be consistent and fix a layout issue.

Add some links between directives.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1853637 13f79535-47bb-0310-9956-ffa450edef68