message: add what is an audience to the markdown
diff: ---
  The auth0 integration is updated to use the `passport-auth0` library. The configuration under `auth.providers.auth0.\*` now supports an optional `audience` parameter; providing that allows you to connect to the correct API to get permissions, access tokens, and full profile information.
  +
  +[What is an Audience](https://community.auth0.com/t/what-is-the-audience/71414)
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