Add APIs and API's to Vale vocabulary

[mintlify]

Summary

• Added APIs and API's to the Vale vocabulary accept list
• These terms were flagged by the vale-spellcheck CI check on PR Document x-default extension for API playground #4781 (commit b96ab99) which modified api-playground/openapi-setup.mdx
• Both are valid: APIs is the standard plural of API, and API's is the possessive form

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Note

Low Risk
Low risk: only updates Vale spellcheck vocabulary to stop flagging common API plural/possessive forms; no runtime code paths are affected.

Overview
Updates the Vale accepted vocabulary (.vale/styles/config/vocabularies/Mintlify/accept.txt) to allow APIs and API's, preventing these terms from being flagged by the spellcheck/CI linter.

^{Written by Cursor Bugbot for commit 1586659. This will update automatically on new commits. Configure here.}

[mintlify]

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