Revert r1602714 per http://httpd.apache.org/docs/2.2/howto/ssi.html#comment_2915
which included 2.4/ap_expr info and examples.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1619923 13f79535-47bb-0310-9956-ffa450edef68