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pythonGH-157724 - GC doc cleanup
- note ob_ref_shared is Py_ssize_t so [size_t-sized](https://docs.python.org/3/c-api/intro.html#c.Py_ssize_t) not necessarily pointer sized. See https://github.com/python/cpython/blob/b0dda158aad00f0064e220f882792a5bd16ba0a0/Include/object.h#L165 , vs claim in original https://github.com/python/cpython/blob/b0dda158aad00f0064e220f882792a5bd16ba0a0/InternalDocs/garbage_collector.md?plain=1#L150 . Also https://peps.python.org/pep-0353/#why-not-py-intptr-t .
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‎InternalDocs/garbage_collector.md‎

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@@ -146,9 +146,8 @@ and, during garbage collection, differentiate reachable vs. unreachable objects.
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```
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Note that not all fields are to scale. `ob_flags` is two bytes, `ob_mutex` and
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`ob_gc_bits` are each one byte, and `ob_ref_local` is four bytes. The
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other fields, `ob_tid`, `ob_ref_shared`, and `ob_type`, are all
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pointer-sized (that is, eight bytes on a 64-bit platform).
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`ob_gc_bits` are each one byte, and `ob_ref_local` is four bytes. As for the
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other fields, `ob_tid`, `ob_type`, are pointer-sized (that is, eight bytes on a 64-bit platform), and `ob_ref_shared` is [size_t-sized](https://docs.python.org/3/c-api/intro.html#c.Py_ssize_t).
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The garbage collector also temporarily repurposes the `ob_tid` (thread ID)

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