Add tool tip about where to setup notifcation methods

https://github.com/webmin/webmin/issues/2594

status/edit_mon.cgi

@@ -167,7 +167,7 @@ foreach $n (keys %notify) {
 	# Don't clear set but un-usable modes
 	print &ui_hidden("notify", $n);
 	}
-print &ui_table_row($text{'mon_notify'}, $notify,
+print &ui_table_row(&hlink($text{'mon_notify'}, "notify"), $notify,
 		    undef, \@tds);
 
 # Show extra address to email

status/help/notify.html

@@ -0,0 +1,6 @@
+<header>Notification methods</header>
+
+Available notification methods for this monitor can be configured on the
+Scheduled Monitoring page. <p>
+
+<footer>