Merge pull request #912 from jmckenna/conf-apache

expand CONFIG tip for Apache

Author: jmckenna

en/mapfile/config.txt

@@ -16,7 +16,10 @@ for different distributions.
 .. TIP::
    For example, compiling from source on Ubuntu, by default MapServer will install 
    a sample config file at */usr/local/etc/mapserver-sample.conf*, and you must 
-   rename that file to *mapserver.conf*.
+   rename that file to *mapserver.conf*, and then add into your Apache *.conf* file:
+   *SetEnv MAPSERVER_CONFIG_FILE "/usr/local/etc/mapserver.conf"*.  You can also
+   set this in your *~/.bashrc* file, so that the MapServer commandline utilities 
+   can find it, by adding there: *export MAPSERVER_CONFIG_FILE "/usr/local/etc/mapserver.conf"*.
 
 .. TIP::  
    For MS4W users (version >= 5), the config