Update documentation to be able to run OAI gNB with OAI UE and COTS UE with...

Update documentation to be able to run OAI gNB with OAI UE and COTS UE with the same configuration file

doc/RUNMODEM.md

@@ -165,7 +165,7 @@ From the `cmake_targets/ran_build/build` folder:
 
 gNB on machine 1:
 
-`sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --sa`
+`sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --gNBs.[0].min_rxtxtime 6 --sa`
 
 UE on machine 2:
 
@@ -173,7 +173,7 @@ UE on machine 2:
 
 With the RF simulator (on the same machine):
 
-`sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --rfsim --sa`
+`sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --gNBs.[0].min_rxtxtime 6 --rfsim --sa`
 
 `sudo ./nr-uesoftmodem -r 106 --numerology 1 --band 78 -C 3619200000 -s 516 --rfsim --sa`