[docs] [issue17851] Grammar errors in threading.Lock documentation

[R. David Murray]

R. David Murray added the comment:

I (as a native English speaker, FWIW) agree that the existing text is correct insofar as the reported problems go.  I, however, would remove the comma after 'block'.  I don't know that it is wrong as written, but it reads strangely to my ear.

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nosy: +r.david.murray

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