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.

(r1853637 in trunk)

+ remove some trailing spaces
+ improve an example to have it more simple (r1816989 in trunk)
 to synch with  trunk

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1853640 13f79535-47bb-0310-9956-ffa450edef68