At long last, document the MSIE "friendly error message" issue.

I was very diplomatic here.  I was tempted to use the apache bully-pulpit to
berate MS over this arrogant mis-feature, but I restrained myself.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95558 13f79535-47bb-0310-9956-ffa450edef68