Cleanup after moving language reference (#31146)
Summary:
Stacked PRs
* **#31146 - [jit] Cleanup after moving language reference**
* #31138 - [jit] Move TorchScript language reference to its own page
Preview: https://driazati.github.io/pytorch_doc_previews/jit.html#torchscript-language
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31146
Pulled By: driazati
Differential Revision: D19167390
fbshipit-source-id: f28daed36754a553264fc8ac142ed22c3e26d63e
