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

[Berker Peksag]

Berker Peksag <berker.peksag at gmail.com> added the comment:

The old tag() example has been replaced with a different example in https://github.com/python/cpython/commit/bde782bb594edffeabe978abeee2b7082ab9bc2a (bpo-33468)

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resolution:  -> duplicate
stage: patch review -> resolved
status: open -> closed
superseder:  -> Add try-finally contextlib.contextmanager example

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue22374>
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