fix: correct small grammar and typo issues in compiler docs/tests

[MarsonKotovi4]

• Changed “preceded” and “intended” typos.
• Replaced “thi” → “this” and fixed a few minor grammar points across various comments.
• No functional code changes, just documentation cleanup.

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @oli-obk (or someone else) some time within the next two weeks.

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[cyrgani]

Same argumentation as #136384 (comment) applies,

[jieyouxu]

This is intended, and "fixing" this is wrong.

[jieyouxu]

We've seen a wave of tiny typo fix PRs similar to yours that we suspect are linked with blockchain rewards. These sometimes result in github deleting the entire account and all PRs of that account, causing trouble for tooling processing commits and corresponding PRs. To avoid encouraging such PRs and to prevent churn from deleted PRs we will not accept such PRs. If you would like to contribute to the project, you are more than welcome to contribute something more substantial.

[workingjubilee]

Internal-facing stylistic PRs are not worth reviewer bandwidth or the required churn, c.f. #58619