Update README.md

Checks are now fully local, no need to disable them at scale.

[ROCm/rccl-tests commit: a2af1d959d]

projects/rccl-tests/README.md

@@ -29,9 +29,9 @@ Run on 8 GPUs (`-g 8`), scanning from 8 Bytes to 128MBytes :
 $ ./build/all_reduce_perf -b 8 -e 128M -f 2 -g 8
 ```
 
-Run with MPI on 40 processes (potentially on multiple nodes) with 4 GPUs each, disabling checks :
+Run with MPI on 40 processes (potentially on multiple nodes) with 4 GPUs each :
 ```shell
-$ mpirun -np 40 ./build/all_reduce_perf -b 8 -e 128M -f 2 -g 4 -c 0
+$ mpirun -np 40 ./build/all_reduce_perf -b 8 -e 128M -f 2 -g 4
 ```
 
 ### Performance