Clarify hide_db

Documentation.html

@@ -838,7 +838,8 @@ since this link provides funding for phpMyAdmin.
 
     <dt><span id="cfg_Servers_hide_db">$cfg['Servers'][$i]['hide_db']</span> string
     </dt>
-    <dd>Regular expression for hiding some databases. This only hides them
+    <dd>Regular expression for hiding some databases to unprivileged users. 
+        This only hides them
         from listing, but a user is still able to access them (using, for example,
         the SQL query area). To limit access, use the MySQL privilege system.
         <br /><br />