Fix some typos of "definition"

[Zalathar]

Tiny PR to fix some typos I stumbled across.

No functional changes.

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[BoxyUwU]

want to add this to our typos config so it gets caught by the CI check?

[Zalathar]

I was planning to, but from looking at the config I couldn’t figure out how.

Is there an example somewhere I can look at?

[lqd]

I was planning to, but from looking at the config I couldn’t figure out how.

IIUC it should be adding something like

definitinon = "definition"

to the [default.extend-words] section of typos.toml

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[Zalathar]

Ah, the comments in typos.toml are very confusing, because the same table is used to blocklist specific bad words, and to allowlist specific good words, with near-identical syntax (because they're typos!)

So from what I can tell:

• mispel = "mispel" adds mispel to the allowlist
• mispel = "" adds mispel to the blocklist
• mispel = "misspell" adds mispel to the blocklist, with an auto-fix of misspell