[issue6288] Update contextlib.nested docs in light of deprecation

[Ask Solem]

Ask Solem <ask at celeryproject.org> added the comment:

How would you replace the following functionality
with the multiple with statement syntax:


    x = (A(), B(), C())
    with nested(*x) as context:
        ....


It seems to me that nested() is still useful for this particular
use case.

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nosy: +asksol

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