fix(dashboard): batter auth failed response message

apps/emqx_dashboard/src/emqx_dashboard.erl

@@ -151,9 +151,9 @@ authorize(Req) ->
                 ok ->
                     ok;
                 {error, token_timeout} ->
-                    {401, <<"TOKEN_TIME_OUT">>, <<"POST '/login', get new token">>};
+                    {401, <<"TOKEN_TIME_OUT">>, <<"Token expired, get new token by POST /login">>};
                 {error, not_found} ->
-                    {401, <<"BAD_TOKEN">>, <<"POST '/login', get new token">>}
+                    {401, <<"BAD_TOKEN">>, <<"Get a token by POST /login">>}
             end;
         _ ->
             return_unauthorized(<<"AUTHORIZATION_HEADER_ERROR">>,