Doc test failure

 [2021/11/16 02:53:13.412] File "migrate-to-pymongo3.rst", line 431, in default

 [2021/11/16 02:53:13.412] Failed example:

 [2021/11/16 02:53:13.412]     try:

 [2021/11/16 02:53:13.412]         client.admin.command("ping")

 [2021/11/16 02:53:13.412]     except ConnectionFailure:

 [2021/11/16 02:53:13.412]         print("Server not available")

 [2021/11/16 02:53:13.412] Expected nothing

 [2021/11/16 02:53:13.412] Got:

 [2021/11/16 02:53:13.412]     {'ok': 1.0}