Fix some typos in documentation (#23507)
Summary:
~~In case of tensor indexing with a scalar index, index_select returns a tensor with the same rank as the input. To match this behavior in ONNX, we make index a 1D tensor so that with a gather
it also produces a tensor with the same rank as the input.~~
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23507
Differential Revision: D16586805
Pulled By: bddppq
fbshipit-source-id: 8f5d964d368873ec372773a29803b25f29a81def
