userId - fix description

[asayah]

Version

1.12.x (latest)

Describe the requested changes

In the doc we have: https://docs.solo.io/gloo-edge/1.10.37/reference/api/github.com/solo-io/gloo/projects/gloo/api/v1/enterprise/options/extauth/v1/extauth.proto.sk/#settings

If the auth server trusted id of the user, it will be set in this header. Specifically this means that this header will be sanitized form the incoming request.

description need clarity, update the doc to mention that is is set by the auth service based on the auth mechanism

Link to any relevant existing docs

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Browser Information

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Additional Context

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