Incorporated the review comments

rajkan01 · rajkan01 · commit 120ca1b245bd · 2019-11-07T07:48:43.000-08:00
diff --git a/TESTS/netsocket/dns/main.cpp b/TESTS/netsocket/dns/main.cpp
@@ -16,7 +16,7 @@
  */
 
 #if !defined(MBED_CONF_RTOS_PRESENT)
-#error [NOT_SUPPORTED] Test not supported.
+#error [NOT_SUPPORTED] dns test cases requires RTOS to run.
 #else
 
 #define WIFI 2
