Update OpenAPI troubleshooting for trailing slash fix

[mintlify]

Summary

OpenAPI endpoint references now automatically resolve trailing slash mismatches (e.g., GET /users/ matches a spec that declares /users, and vice versa). This updates the troubleshooting page to reflect the fix: the previous trailing slash example is replaced with a note explaining automatic resolution, and the example now illustrates a different common typo (singular vs. plural path segments).

Triggered by mintlify/mint@d97945a.

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Note

Low Risk
Documentation-only change updating troubleshooting guidance; no runtime behavior or security-sensitive logic is modified.

Overview
Updates the OpenAPI troubleshooting docs to reflect that trailing slash mismatches are now auto-resolved when matching openapi page metadata to spec paths.

Replaces the prior trailing-slash failure example with a new example highlighting a different common mismatch (singular vs plural path segments, e.g. /user/{id} vs /users/{id}).

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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.