Fix grammar typos in comments and docstrings (#194417)

Corrects subject-verb agreement, past-participle forms ("ran" -> "run"),
and a few wrong words ("Mobile" -> "Module", "pickable" -> "picklable",
"number elements" -> "number of elements") across comments and docstrings.
No functional changes.

Test Plan: comment- and docstring-only changes, so no behavior to test.
Verified nothing outside comments and docstrings was touched.

This change was authored with the help of an AI assistant.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/194417
Approved by: https://github.com/aorenste