Update error message with torch logging instructions (#102892)

#100109

Pull Request resolved: #102892
Approved by: https://github.com/yanboliang

torch/_dynamo/exc.py

@@ -168,7 +168,7 @@ def augment_exc_message(exc, msg="\n"):
  torch._dynamo.replay('{exc.record_filename}').\n"
 
     if not config.verbose and hasattr(exc, "real_stack"):
-        msg += "\nSet torch._dynamo.config.verbose=True or TORCHDYNAMO_VERBOSE=1 for more information\n"
+        msg += '\nSet TORCH_LOGS="+dynamo" and TORCHDYNAMO_VERBOSE=1 for more information\n'
 
     if hasattr(exc, "inner_exception") and hasattr(
         exc.inner_exception, "minifier_path"