Update OpenAPI docs for trailing slash tolerance

[mintlify]

Summary

Updates documentation to reflect that Mintlify now tolerates trailing slash differences in OpenAPI endpoint references (from mintlify/mint#7171).

• Removed the trailing slash mismatch warning from the troubleshooting page, replacing it with a note that trailing slashes are now handled gracefully
• Updated the "exact match" language in the OpenAPI setup page to clarify that trailing slash differences are tolerated
• Applied equivalent changes to all localized versions (fr, es, zh)

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Note

Low Risk
Low risk documentation-only updates clarifying endpoint matching behavior; no code or runtime behavior changes.

Overview
Clarifies OpenAPI endpoint reference matching to note that trailing slashes are tolerated (e.g., /users and /users/), while still preferring exact matches when both variants exist in the spec.

Updates the same guidance in openapi-setup.mdx and troubleshooting.mdx, and applies equivalent wording across localized docs (ES/FR/ZH), removing the prior “must match exactly”/trailing-slash mismatch example in troubleshooting.

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