Suggest to use a protocol instead of a module

[sobolevn]

@AlexWaygood do you have any suggestions about the error message?

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

apprise (https://github.com/caronc/apprise)
+ apprise/config/ConfigBase.pyi:3: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:6: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:12: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:21: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:29: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:35: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:38: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:43: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:44: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:45: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseConfig.pyi:47: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseAttachment.pyi:6: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseAttachment.pyi:27: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseAttachment.pyi:33: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/AppriseAttachment.pyi:34: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/Apprise.pyi:17: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/Apprise.pyi:24: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/Apprise.pyi:31: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/Apprise.pyi:43: note: Perhaps you meant to use a protocol matching the module structure?
+ apprise/Apprise.pyi:53: note: Perhaps you meant to use a protocol matching the module structure?

[sobolevn]

Diff is correct, there's a module in apprise's Union: https://github.com/caronc/apprise/blob/master/apprise/AppriseConfig.pyi#L6

[hauntsaninja]

Thanks!

[AlexWaygood]

^The error message looks pretty good to me! The only way I can really see to improve it while keeping it reasonably short would be to maybe link to some docs describing the problem in more detail. But I'm not sure whether it's worth that.