[docs] [issue37432] Fix a small param type in allocation.rst

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset ad00640f936956c3a19834b6cd12b04edf53a776 by Miss Islington (bot) in branch '3.8':
bpo-37432: Doc: Fix signature of PyObject_Del() (GH-14430)
https://github.com/python/cpython/commit/ad00640f936956c3a19834b6cd12b04edf53a776


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