Type hints for snmp error handling function is incorrect

[stveit]

The current _handle_errors looks like this:

def _handle_errors(self, error_indication: str, error_status: str, error_index: int, *query: ObjectType) -> bool:

The values that are supposed to be put into this function are the return values from any of the pysnmp command functions (getCmd, bulkCmd etc). The typehints you see above are correct if you compare them to the docstring of these functions.

I am however pretty certain that the docstrings are outdated. I know for a fact that error_indication can be a pysnmp.proto.errind.RequestTimedOut object (see #76). This is a subclass of the errind.ErrorIndication class, so logically the error_indication value can probably be any type of errind.ErrorIndication. From examples online, I've seen that the value can also be None, but I have not seen any examples of it actually returning a str.

I've also seen error_status return an int, but I can't recall seeing it return a str as the docstring states it should.