Update README.md

targets/ARCH/rfsimulator/README.md

@@ -121,7 +121,7 @@ Client gNB machine: iperf -c 10.0.1.2 -u -b 0.1M --bind 10.0.1.1
 ```iperf (Uplink):
 Server gNB machine: iperf -s -i 1 -u -B 10.0.1.1
 Client nrUE machine: iperf -c 10.0.1.1 -u -b 0.1M --bind 10.0.1.2
-Note: iperf tests cannot be performed only when running gNB and nrUE on separate hosts. 
+Note: iperf tests can be performed only when running gNB and nrUE on separate hosts. 
 ```
 
 ### Store and replay