Fixed torch.arange docs (#18604)
Summary:
Kindly let me know if its okay and if any places i need to make a fix. Closes #18534
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18604
Differential Revision: D14680712
Pulled By: soumith
fbshipit-source-id: 030e4a3d8f7839cbe2b8a3ef386323f0d39eb81a
