benchmarks: Update the documentation.

Update the locations of the benchmark binaries to match where they
are currently installed.
diff --git a/benchmarks/README.md b/benchmarks/README.md
index b3f0c3d..2616a51 100644
--- a/benchmarks/README.md
+++ b/benchmarks/README.md
@@ -13,8 +13,8 @@
     $ mma
     $ adb remount
     $ adb sync
-    $ adb shell /data/nativetest/bionic-benchmarks/bionic-benchmarks
-    $ adb shell /data/nativetest64/bionic-benchmarks/bionic-benchmarks
+    $ adb shell /data/benchmarktest/bionic-benchmarks/bionic-benchmarks
+    $ adb shell /data/benchmarktest64/bionic-benchmarks/bionic-benchmarks
 
 When operated without specifying an xml file, the default is to run all
 of the benchmarks in alphabetical order.