docs: document overriding auto-generated Authorization description

[mintlify]

Documentation changes

Adds a subsection to the OpenAPI setup page explaining that users can override the auto-generated Authorization field description in the API playground by setting a description on the security scheme in their OpenAPI spec. Customers frequently miss that this is customizable.

Closes

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Generated by Mintlify Agent.

Requested by: hahnbee@mintlify.com via Slack
Mintlify session: slack_1784605763.271809_C0A6A37P2AK

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Note

Low Risk
Documentation-only changes with no runtime or configuration behavior impact.

Overview
Documents how to replace Mintlify’s auto-generated Authorization playground help text by setting a description on the security scheme in OpenAPI (components.securitySchemes).

The new API playground troubleshooting accordion explains that Markdown in that field applies on every endpoint using the scheme, with a bearer-auth JSON example. openapi-setup.mdx only drops an extra blank line—no new setup subsection in this diff.

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