Fix grammar and typos in code comments and docstrings (#194419)

Sweep of pre-existing grammatical slips in comments and docstrings across
inductor, the JIT frontend/passes/runtime, the C++ data API, FX, export, and
the headeronly float8 helpers. Most are missing or misplaced articles and
prepositions ("in to" -> "into", "rather the" -> "rather than the", "a from"
-> "from a"), plus subject/verb agreement in the multipledispatch docstring.

No functional changes; comments and docstrings only.

Test Plan: no runtime behavior is touched, so no tests were run.

Authored with the assistance of an AI coding agent.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/194419
Approved by: https://github.com/aorenste