Update name

Author: kirklandsign

extension/android/README.md

@@ -29,7 +29,7 @@ sh scripts/build_android_library.sh
 ```
 
 The AAR file will be `extension/android/executorch_android/build/outputs/aar/executorch_android-debug.aar`.
-If you set an environment variable `BUILD_AAR_DIR`, then the AAR will be copied to `$BUILD_AAR_DIR`.
+If you set an environment variable `BUILD_AAR_DIR`, then the AAR will be copied to `$BUILD_AAR_DIR/executorch.aar`.
 Later, you can copy `$BUILD_AAR_DIR/executorch.aar` to your app directory to use as a library.
 
 Please see [Android building from source](https://pytorch.org/executorch/main/using-executorch-android.html#building-from-source) for details