Update prefill pattern to include plural form

[mintlify]

Summary

• Updates the Vale vocabulary pattern for prefill to include the plural form prefills
• The pattern prefill(ing|ed)? has been changed to prefill(s|ing|ed)?

This addresses a Vale spelling warning flagged in PR #4040.

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Note

Low Risk
Low risk configuration-only change that only affects Vale linting behavior by expanding an allowed term pattern.

Overview
Updates Vale’s accept.txt vocabulary regex for prefill to also allow the plural form prefills (changing prefill(ing|ed)? to prefill(s|ing|ed)?), reducing false-positive spelling warnings during docs linting.

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