backport note about ServerAlias/ServerName or exact-match/wildcard not really...

backport note about ServerAlias/ServerName or exact-match/wildcard not really having any precedence over one another

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1308110 13f79535-47bb-0310-9956-ffa450edef68