workshop: add freeipa version requirements

Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>

doc/workshop/11-kerberos-ticket-policy.rst

@@ -8,6 +8,8 @@ Unit 11: Kerberos ticket policy
 In this module you will explore how to manage properties of Kerberos
 authentication and authorization in FreeIPA.
 
+**Note:** To complete this module, FreeIPA-4.8.3 or later is needed.
+
 Kerberos ticket policies
 ------------------------
 

doc/workshop/12-external-idp-support.rst

@@ -8,6 +8,8 @@ Unit 12: Authentication against external Identity Providers
 In this module you will explore how to manage use external OAuth 2.0 servers to
 authorize issuance of Kerberos tickets in FreeIPA.
 
+**Note:** To complete this module, FreeIPA-4.10 or later is needed.
+
 Authentication using external Identity Providers
 ------------------------------------------------