fix typos in torch/csrc/deploy/README.md (#70494)
Summary:
Fixes typo in torch/csrc/deploy/README.md
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70494
Reviewed By: mikaylagawarecki
Differential Revision: D33354431
Pulled By: H-Huang
fbshipit-source-id: b05757a795d2700eea21d7b881d87a7b239a8b52
