add logout URL

Author: ethanpalm

authentication-personalization/authentication-setup.mdx

@@ -106,6 +106,7 @@ Your documentation is hosted at `docs.foo.com` and your team uses the dashboard
       * **Scopes**: Permissions to request. Use multiple scopes if you need different access levels.
       * **Token URL**: Your OAuth token exchange endpoint.
       * **Info API URL** (optional): Endpoint to retrieve user info for personalization. If omitted, the OAuth flow will only be used to verify identity and the user info will be empty.
+      * **Logout URL**: The native logout URL for your OAuth provider. If your provider has a `returnTo` or similar parameter, point it back to your docs URL.
     4. Select **Save changes**.
   </Step>
   <Step title="Configure your OAuth server.">
@@ -131,6 +132,7 @@ Your documentation is hosted at `foo.com/docs` and you have an existing OAuth se
 - **Scopes**: `['docs-user-info']`
 - **Token URL**: `https://auth.foo.com/exchange`
 - **Info API URL**: `https://api.foo.com/docs/user-info`
+- **Logout URL**: `https://auth.foo.com/logout?returnTo=https%3A%2F%2Ffoo.com%2Fdocs`
 
 **Create a user info endpoint** at `api.foo.com/docs/user-info`, which requires an OAuth access token with the `docs-user-info` scope, and returns: