[issue32208] Improve semaphore docmentation

[Garrett Berg]

Garrett Berg <googberg at gmail.com> added the comment:

It may be desirable to change:

> Once awoken, decrement the counter by 1.

to

> Once awoke, decrement the counter (which is guaranteed to be positive) by 1.

Although this could be considered obvious since the counter can never go below zero.

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<https://bugs.python.org/issue32208>
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