[issue37105] Add deprecated-remove information on stream doc

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I'd say close it, the deprecation can be a separate issue (usually is) and I don't think we need to backport such a minor docs issue to 3.8. The PR is old enough that it made 3.9+3.10 I think (did you check?).

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nosy: +gvanrossum

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