[docs] [issue21202] Naming a file` io.py` causes cryptic error message

Brett Cannon added the comment:

While mentioning something in the FAQ and/or tutorial is fine, I wouldn't want to change Python's message too much to deal with this unless it was extremely fast (e.g. we pre-generated a set and check that on ImportError and then modified the message only in those instances).

---------- nosy: +brett.cannon

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