Add <compatibility> note for CGIScriptTimeout.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1916704 13f79535-47bb-0310-9956-ffa450edef68

Author: Christophe Jaillet

docs/manual/mod/mod_cgi.xml

@@ -185,6 +185,7 @@ unset</default>
 <contextlist><context>server config</context>
 <context>virtual host</context><context>directory</context>
 <context>.htaccess</context></contextlist>
+<compatibility>Available in version 2.5.1 and later.</compatibility>
 
 <usage>
     <p>This directive limits the length of time to wait for more output from