Update test/test_retryable_reads.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: NoahStapp

test/test_retryable_reads.py

@@ -405,7 +405,7 @@ def test_overload_then_nonoverload_retries_increased_reads(self) -> None:
         listener = OvertCommandListener()
 
         # Configure the client to listen to CommandFailedEvents. In the attached listener, configure a fail point with error
-        # code `91` (NotWritablePrimary) and `RetryableError` and `SystemOverloadedError` labels.
+        # code `91` (ShutdownInProgress) and `RetryableError` and `SystemOverloadedError` labels.
         overload_fail_point = {
             "configureFailPoint": "failCommand",
             "mode": {"times": 1},