Fix docs for PyThreadState_GetDict() in threads.rst

[manoj-marimuthu]

The following PR focusses on fixing 2 sentences for better clarity and readability for the documentation of PyThreadState_GetDict() in threads.rst
The sentences are:

Each extension should use a unique key to use to store state in
the dictionary.

If this function returns
``NULL``, no exception has been raised and the caller should assume no
thread state is attached.

[read-the-docs-community]

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1 file changed

± c-api/threads.html