mm_state_{gb,iu}_fsm: Add missing license block, improve spec references

Change-Id: Ifcfd9c11005a388220c599e7b2f6901175141f1c
diff --git a/include/osmocom/sgsn/gprs_mm_state_iu_fsm.h b/include/osmocom/sgsn/gprs_mm_state_iu_fsm.h
index 7f02bcc..7e11ac9 100644
--- a/include/osmocom/sgsn/gprs_mm_state_iu_fsm.h
+++ b/include/osmocom/sgsn/gprs_mm_state_iu_fsm.h
@@ -4,8 +4,7 @@
 
 struct sgsn_mm_ctx;
 
-
-/* TS 23.060 6.1.1 Mobility Management States (A/Gb mode) */
+/* TS 23.060 § 6.1.2 Mobility Management States (Iu mode) */
 enum mm_state_iu_fsm_states {
 	ST_PMM_DETACHED,
 	ST_PMM_CONNECTED,