Update user guide to run test on simulator

Signed-off-by: Arun Rangasamy <arangasa@qti.qualcomm.com>

Author: arunrangasa

docs/user-guide.md

@@ -286,11 +286,12 @@ which linalg-hexagon-opt
 lit triton/build/cmake.linux-x86_64-cpython-${PYTHON_VERSION}/third_party/qcom_hexagon_backend/test/
 ```
 
-*NOTE*: Steps 3 and 4 are only applicable if you have access to a Qualcomm Hexagon NPU device.
-If you do not have access to such a device, you can skip these steps; however, please contact us at [hexagon-mlir.support@qti.qualcomm.com](mailto:hexagon-mlir.support@qti.qualcomm.com) for assistance in obtaining access to a test device.
+*NOTE*: Steps 3 and 4 are applicable for running tests on Qualcomm Hexagon NPU devices or on simulator.
+For assistance in obtaining access to a test device, please contact us at [hexagon-mlir.support@qti.qualcomm.com](mailto:hexagon-mlir.support@qti.qualcomm.com).
 
 ### Step 3: Run Triton Test
 If you have access to a Qualcomm NPU device, please set the variables ANDROID_HOST and ANDROID_SERIAL to the host name and hexagon device number.
+If you do not have access to a Qualcomm NPU device, you can still run the test on hexagon simulator. Please set RUN_ON_SIM environment variable to 1 before running the tests.
 You can then run an end-to-end compilation and execution flow using the following command:
 ```bash
 # Compile and execute a simple Triton kernel