Align URL with latest Keycloak versions that don't have the /auth prefix
What does this MR do and why?
This PR updates the docs to remove the /auth
part of the Keycloak URL which is no longer present in new installations.
See https://www.keycloak.org/migration/migrating-to-quarkus for details.
Without that change, GitLab will respond with "Not Found" to the invalid URL.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.