Fix grammar and typos in code comments and docstrings (#194494)

Corrects small grammatical errors and typos across a handful of comments
and docstrings: missing articles and verbs ("this a" -> "this is a", "the
number elements" -> "the number of elements"), subject-verb agreement in
the quantizable MultiheadAttention attn_mask description, "a integral" ->
"an integral", "reocrd" -> "record", and a few awkward phrasings such as
"recursively be compiled" and "an explicit called to".

No functional changes; documentation and comments only.

Test Plan: no code paths are affected, so no tests were run beyond lint.

```
lintrunner -a
```

This change was authored with the help of an AI assistant.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/194494
Approved by: https://github.com/aorenste