Add description of Networking

htdocs/admin/site/networking.php

@@ -59,6 +59,11 @@ $networkingform = pieform(
         'name'     => 'networkingform',
         'jsform'   => true,
         'elements' => array(
+            'whatis' => array(
+                'type'         => 'html',
+                'title'        => get_string('whatisnetworking','admin'),
+                'value'        => get_string('whatnetworkingis','admin')
+            ),
             'wwwroot' => array(
                 'type'         => 'html',
                 'title'        => get_string('wwwroot','admin'),

htdocs/lang/en.utf8/admin.php

@@ -135,6 +135,8 @@ $string['promiscuousmodedisabled'] = 'Auto-register has been disabled. ';
 $string['promiscuousmodeenabled'] = 'Auto-register has been enabled. ';
 $string['promiscuousmodedescription'] = 'Create an institution record for any host that connects to you, and allow its users to log on to Mahara';
 $string['wwwroot'] = 'WWW Root';
+$string['whatisnetworking'] = 'What is Networking?';
+$string['whatnetworkingis'] = 'Mahara\'s networking features allow it to communicate with Mahara or Moodle sites running on the same or another machine. If networking is enabled, you can use it to configure single-sign-on for users who log in at either Moodle or Mahara.';
 
 // Admin menu editor
 //$string['menueditor']    = 'Menu editor';