Apply suggestions from code review

Co-authored-by: Dan Davison <dan.davison@temporal.io>

Author: drewhoskins-temporal

polling/test_service.py

@@ -3,7 +3,7 @@ def __init__(self):
         self.error_attempts = 5
 
     async def get_service_result(self, input, attempt: int):
-        print(f"Attempt {attempt}" f" of {self.error_attempts} to invoke service")
-        if attempt % self.error_attempts == 0:
+        print(f"Attempt {attempt} of {self.error_attempts} to invoke service")
+        if attempt > self.error_attempts:
             return f"{input.greeting}, {input.name}!"
         raise Exception("service is down")