add info about jit provisioning in migration guide

Author: msukkari

docs/self-hosting/upgrade/v3-to-v4-guide.mdx

@@ -36,7 +36,7 @@ Please note that the following features are no longer supported in v4:
 
         ![Pending Approval Page](/images/pending_approval.png)
 
-        The owner can view and approve join requests by navigating to **Settings -> Members**
+        The owner can view and approve join requests by navigating to **Settings -> Members**. Automatic provisioning of accounts is supported when using SSO/Oauth providers, check out the [auth docs](/self-hosting/configuration/authentication#enterprise-authentication-providers) for more info
 
     </Step>
     <Step title="You're done!">