Purpose (TL;DR) - mandatory
This PR corrects misspellings identified by the check-spelling action.
Background (Problem in detail) - optional
The misspellings have been reported at jsoref@e1260cf#commitcomment-55109018
How to verify - mandatory
The action reports that the changes in this PR would make it happy: jsoref@b45b0b0
Checklist for author
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