Cleanup PyTorch getting started page. (#10886)
Cleanup PyTorch getting started page. (#10886)

Follow-up to https://github.com/iree-org/iree/pull/10757

* Fix table formatting (single column table needs `| text here |`
instead of `text here`)
* Fix note formatting
(https://squidfunk.github.io/mkdocs-material/reference/admonitions/)
* Fix numbered list formatting
(https://squidfunk.github.io/mkdocs-material/reference/lists/#using-ordered-lists)
* Wrap some lines at 80 characters (purely a style choice, some
formatters do this automatically)
* Tweak some phrasing / grammar

(steps to preview changes to the website locally are here:
https://github.com/iree-org/iree/tree/main/docs/website)
google/iree,google/iree,iree-org/iree,google/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree