Add link in the Backup page to the Guide

src/web/ejabberd_web_admin.erl

@@ -2030,7 +2030,7 @@ get_node(global, Node, ["backup"], Query, Lang) ->
 	       ok -> [?XREST("Submitted")];
 	       {error, Error} -> [?XRES(?T("Error") ++": " ++ io_lib:format("~p", [Error]))]
 	   end,
-    [?XC("h1", ?T("Backup of ") ++ atom_to_list(Node))] ++
+    ?H1GL(?T("Backup of ") ++ atom_to_list(Node), "list-eja-commands", "List of ejabberd Commands") ++
 	ResS ++
 	[?XCT("p", "Please note that these options will only backup the builtin Mnesia database. If you are using the ODBC module, you also need to backup your SQL database separately."),
      ?XAE("form", [{"action", ""}, {"method", "post"}],