Update tutorial-six-python.md

formatting issue

Author: randommm

site/tutorials/tutorial-six-python.md

@@ -312,7 +312,7 @@ class FibonacciRpcClient(object):
                 correlation_id=self.corr_id,
             ),
             body=str(n))
-	while self.response is None:
+        while self.response is None:
             self.connection.process_data_events(time_limit=None)
         return int(self.response)