Indicating path to the execution folder

Code snippet in Step 4 fails, as it refers to main.py script under ./src folder (that was used by the original Jupyter notebook). As this example is being used against the whole repo, it's worth to specify that the long path is  ./sdk/python/jobs/single-step/lightgbm/iris/src, for the people who copy/paste the code to make it work.

Author: LazaUK

articles/machine-learning/how-to-train-model.md

@@ -175,7 +175,7 @@ curl -X PUT \
 
 # [Python SDK](#tab/python)
 
-To run this script, you'll use a `command`. The command will be run by submitting it as a `job` to Azure ML. 
+To run this script, you'll use a `command` that executes main.py Python script located under ./sdk/python/jobs/single-step/lightgbm/iris/src/. The command will be run by submitting it as a `job` to Azure ML. 
 
 [!notebook-python[] (~/azureml-examples-main/sdk/python/jobs/single-step/lightgbm/iris/lightgbm-iris-sweep.ipynb?name=create-command)]