Change httpd.conf default UseCanonicalName to off to make the server

Change httpd.conf default UseCanonicalName to off to make the server
more idiot proof.

Also, move UseCanonicalName to directly under ServerName to make the
connection clearer, and clean up the comments.

I removed the http://123.123.123.231/ example, because it just makes it
too tempting for people to use
ServerName http://123.23.23.23/

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93396 13f79535-47bb-0310-9956-ffa450edef68