fix misspelled issue

[kianjib7]

No description provided.

[rustbot]

r? @Mark-Simulacrum

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[rustbot]

The Miri subtree was changed

cc @rust-lang/miri

[RalfJung]

Thanks for the PR! Note that we usually don't accept typo fixes for internal, non-user-facing comments. It's not worth the churn.

I'm willing to land this anyway since you already went through the effort, but please squash the PR into a single commit.