Merge r1438833 from https://svn.apache.org/repos/asf/httpd/httpd/trunk/:

http://httpd.apache.org/docs/2.4/platform/windows.html#comment_760

Get rid of "SystemRoot" used where ServerRoot was meant, by dropping this
whole part of the sentence. 

(use drive letters, unless they're network drives and you're running as 
a service ...)



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1438836 13f79535-47bb-0310-9956-ffa450edef68