[docs] [issue22374] Replace contextmanager example and improve explanation

Serhiy Storchaka report at bugs.python.org
Thu Jun 2 15:04:47 EDT 2016

Serhiy Storchaka added the comment:

swap_attr() looks too general. I think something more concrete would be better. But the documentation already contain other examples for contextmanager. closing() is good example, and redirect_stdout() would be good example.

nosy: +serhiy.storchaka

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