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

Change-Id: Ifcfd9c11005a388220c599e7b2f6901175141f1c
diff --git a/include/osmocom/sgsn/gprs_mm_state_gb_fsm.h b/include/osmocom/sgsn/gprs_mm_state_gb_fsm.h
index e69e1e1..02dcac7 100644
--- a/include/osmocom/sgsn/gprs_mm_state_gb_fsm.h
+++ b/include/osmocom/sgsn/gprs_mm_state_gb_fsm.h
@@ -5,7 +5,7 @@
 struct sgsn_mm_ctx;
 
 
-/* TS 23.060 6.1.1 Mobility Management States (A/Gb mode) */
+/* TS 23.060 § 6.1.1 Mobility Management States (A/Gb mode) */
 enum mm_state_gb_fsm_states {
 	ST_MM_IDLE,
 	ST_MM_READY,