[issue34172] multiprocessing.Pool and ThreadPool leak resources after being deleted

[mattip]

mattip <matti.picus at gmail.com> added the comment:

It would be sufficient to modify the documentation to reflect the code. 

There are other objects like `file` that recommend[0] calling a method to release resources without depending on implementation-specific details like garbage collection.

[0] https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files

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nosy: +mattip

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