[docs] [issue21763] Clarify requirements for file-like objects

[R. David Murray]

R. David Murray added the comment:

Re-reading my last paragraph, I see that I'm pretty much agreeing with you.  So the contention is more that we don't think your suggested patch is necessary.  Especially since, unlike your patch wording says, in fact most of the methods *are* implemented in the classes.

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