Update troubleshooting: OpenAPI trailing slashes now tolerated

[mintlify]

Summary

Updates the API playground troubleshooting page to reflect that Mintlify now tolerates trailing-slash mismatches in OpenAPI endpoint references (fixed in mintlify/mint#7171).

• Removed the outdated example showing trailing slashes as a problem
• Added a <Note> explaining that trailing-slash mismatches are now handled automatically
• Updated all localized versions (en, es, fr, zh)

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Note

Low Risk
Low risk documentation-only updates across multiple locales; no product logic or configuration behavior is changed.

Overview
Updates the API playground troubleshooting guidance to reflect that OpenAPI endpoint references tolerate trailing-slash mismatches.

Removes the prior trailing-slash mismatch “blank page” example and replaces it with a Note explaining the new behavior, applying the same wording change across en, es, fr, and zh.

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[ethanpalm]

Closing as duplicate of #5478. Multiple PRs were opened documenting the same OpenAPI trailing slash tolerance fix (mint#7171). PR #5478 is the most recent and comprehensive version and will be reviewed separately.