[docs] [issue32208] Improve semaphore documentation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The changes you are proposing sound reasonable to me.  Would you like to submit a pull request for them?

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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python, pitrou
stage:  -> needs patch
versions:  -Python 3.4, Python 3.5, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32208>
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