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

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Good point - I forgot about the docstring.

Yes, I think that should be changed to use the new wording up to the new
example (similar to the way the old docstring stopped at the example).

Reopening until that is done (although reducing from release blocker status)

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priority: release blocker -> high
status: closed -> open

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