We need an explicit warning about how to prevent the installation of RH-SSO in the MTA Operator by using the `feature_auth_required` setting in the Tackle CR. 

I would create a warning admonition snippet containing this information and including it in the Installation sections - https://docs.redhat.com/en/documentation/migration_toolkit_for_applications/7.1/html/user_interface_guide/mta-7-installing-web-console-on-openshift_user-interface-guide#installing-mta-operator-and-ui_user-interface-guide

And also in the RHSSO section - https://docs.redhat.com/en/documentation/migration_toolkit_for_applications/7.1/html/user_interface_guide/mta-7-installing-web-console-on-openshift_user-interface-guide#mta-7-red-hat-single-sign-on_user-interface-guide

Also improve the description in the Tackle CR setting

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