Merge r1040517 from trunk:

PR50382:  explain in mod_env documentation that these environment variables aren't just for CGI and SSI.

(short rehash of info in env.html)




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1040519 13f79535-47bb-0310-9956-ffa450edef68