costdev ecd4a277b7 Docs: Use US spelling and correct a typing mistake.
This changes two inline comments and a docblock so that they use US spelling as advised by the Core Handbook's Best Practices. A typing mistake is also corrected.

Reference:
- [https://make.wordpress.org/core/handbook/best-practices/spelling/ Core Handbook - Best Practices - Spelling].

Follow-up to [18632], [38120], [44954].

Props kebbet, mukesh27.
See #58833.
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