[torch deploy] Update deploy.rst with working simple example (#76538)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76538
when running the example from the docs, I found that these steps were not working.
These are the updates necessary to get the example working.
Test Plan: n/a
Reviewed By: PaliC
Differential Revision: D35998155
fbshipit-source-id: d78bb2886f94889abae5a3af5239fcd306cd5e09
(cherry picked from commit 6893812efe7443b437ccafb7b1ff6bc7bd2e6670)
