feature set update

doc/FEATURE_SET.md

@@ -313,6 +313,7 @@ The following features are valid for the gNB and the 5G-NR UE.
 - MAC downlink scheduler
   - phy-test scheduler (fixed allocation and usable also without UE)
   - regular scheduler with dynamic allocation
+  - MCS adaptation from HARQ BLER
 - MAC header generation (including timing advance)
 - ACK / NACK handling and HARQ procedures for downlink
 - MAC uplink scheduler