DOC-5858 RS: Added more info about enforce_control_plane SSO to RS REST API reference

Author: rrelledge

content/operate/rs/references/rest-api/objects/sso.md

@@ -15,7 +15,7 @@ An API object that represents single sign-on (SSO) configuration in the cluster.
 | Name | Type/Value | Description |
 |------|------------|-------------|
 | control_plane | boolean (default: false) | If `true`, enables single sign-on (SSO) for the control plane. |
-| enforce_control_plane | boolean (default: false) | Enforce SSO login for the control plane for non-admin users. |
+| enforce_control_plane | boolean (default: false) | If `true`, enforce SSO login for the control plane for non-admin users. If `false`, all users can still login using their local username and password if SSO is down. |
 | protocol | "saml2" | SSO protocol to use. |
 | issuer | complex object	 | Issuer related configuration.<br>Contains the following fields:<br>**id**: Unique ID of the issuer side (example: "urn:sso:example:idp")<br>**login_url**: SSO login URL (example: "https://idp.example.com/sso/saml")<br>**logout_url**: SSO logout URL (example: "https://idp.example.com/sso/slo") |
 | service | complex object	 | Service related configuration.<br />For SAML2 service configuration:<br />{{<code>}}{