docs: correct typo in "Disputable Superlatives" section

[onasilos]

A typo in the "What to Avoid" section.
The word "Superlative" was used in the singular form, but it should be plural: "Superlatives."

• Fix: Changed "Disputable Superlative" to "Disputable Superlatives."

This ensures consistency and clarity in the guide.

[cb-heimdall]

✅ Heimdall Review Status

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[wbnns]

Thanks! Please fix the merge conflict 🙏