Fix bad annotation in docs (#19501)
Summary:
Stack from [ghstack](https://github.com/ezyang/ghstack):
* **#19501 [jit] Fix bad annotation in docs**
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19501
Pulled By: driazati
Differential Revision: D15016062
fbshipit-source-id: 3dcd0481eb48b84e98ffe8c5df2cbc9c2abf99f9
