Fix typo (extra sapce) in example spoted by Juan Antonio Rua Soto in online doc.

Add a few more links to modules and directives (more could be done)
(r1737433 in trunk)

+ Synch with trunk

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1737438 13f79535-47bb-0310-9956-ffa450edef68