Update module name referenced in README.md

Test: atest-src google/perf/jank/UIBench/UIBench-Lock -v
Bug: 170349152

Change-Id: I0dfb9422b068952c6f4d506a8fbfa5316dbe9886
diff --git a/benchmarks/README.md b/benchmarks/README.md
index fe447d1..1fd17a1 100644
--- a/benchmarks/README.md
+++ b/benchmarks/README.md
@@ -184,5 +184,5 @@
 Some devices have a `perf-setup.sh` script that locks CPU and GPU frequencies. Some TradeFed
 benchmarks appear to be using the script. For more information:
  * run `get_build_var BOARD_PERFSETUP_SCRIPT`
- * run `m perf-setup.sh` to install the script into `${OUT}/data/local/tmp/perf-setup.sh`
+ * run `m perf-setup` to install the script into `${OUT}/data/local/tmp/perf-setup.sh`
  * see: https://android.googlesource.com/platform/platform_testing/+/refs/heads/master/scripts/perf-setup/