Fix minor style/typos problems in comment_device_type.py (#54768)
Summary:
One typo, one example correction and capitalization for a couple of comment lines.
ailzhang
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54768
Reviewed By: H-Huang
Differential Revision: D27362999
Pulled By: ezyang
fbshipit-source-id: 91404ac9e9747ef7d7882a5f50b81d7eb570448b
