Update 4-env-setup-execut.md

Final

Author: madeline-underwood

content/learning-paths/embedded-and-microcontrollers/visualizing-ethos-u-performance/4-env-setup-execut.md

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+## Set up overview
 
-Get your development environment ready to deploy and run models with ExecuTorch.
+Before you can deploy and test models with ExecuTorch, you need to set up your local development environment. This section walks you through installing system dependencies, creating a virtual environment, and cloning the ExecuTorch repository on Ubuntu or WSL. Once complete, you'll be ready to run TinyML models on a virtual Arm platform.
 
 ## Install system dependencies