Update assert message

Author: Georgi Mirazchiyski

sycl/test-e2e/Basic/launch_queries/max_num_work_groups.cpp

@@ -164,7 +164,10 @@ int test_max_num_work_groups(sycl::queue &q, const sycl::device &dev) {
   // Note: Level-Zero currently always returns a non-zero value.
   // TODO: Remove the backend condition once the Level-Zero API issue is fixed.
   if (dev.get_backend() != sycl::backend::ext_oneapi_level_zero) {
-    assert(maxWGs == 0 && "max_num_work_groups query failed");
+    assert(maxWGs == 0 &&
+           "max_num_work_groups query failed.\n"
+           "It should return 0 possible groups when the requested resources "
+           "by the lanuch config exceed those available in the hardware.");
   }
 
   // As we ensured that the 'max_num_work_groups' query correctly