pytorch: fix typo in quantization docs (#73511)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73511
Fixes typo in describing the `torch.qint32` data type.
Test Plan: CI
Reviewed By: andrewor14
Differential Revision: D34522741
Pulled By: vkuzo
fbshipit-source-id: f05f8440d9708281213a4b3736e8f59199dd7b1a
(cherry picked from commit ca9e598d60cac016e58fda9cd0f329ca412ec36b)
