[issue38816] Clarify about fork() and the CPython runtime in the C-API docs.

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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keywords: +patch
pull_requests: +16686
pull_request: https://github.com/python/cpython/pull/17178

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<https://bugs.python.org/issue38816>
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