Update debug_guide.md (Azure#28934)

doc/dev/debug_guide.md

@@ -3,7 +3,7 @@
 This guide is to help Python SDK users to get the process about how SDK call REST api
 
 (1) Copy the following code in your .py file
-```
+```python
 import sys
 import logging
 
@@ -18,6 +18,15 @@ handler.setFormatter(formatter)
 
 ![Position example](./debug_guide_position.png "Position example")
 
+nit: the following code has same effect:
+```python
+import sys
+import logging
+
+logging.basicConfig(level=logging.DEBUG,
+                    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
+                    stream=sys.stdout)
+```
 (2) Run your .py program and you could find the log info in screen. It is convenient to get the process about how SDK call REST api:
 
 ![example](./debug_guide_example.png "example")