Update getting-started.md

Author: shoumikhin

docs/source/llm/getting-started.md

@@ -45,13 +45,17 @@ cd et-nanogpt
 
 # Clone the ExecuTorch repository and submodules.
 mkdir third-party
-git clone -b release/0.4 https://github.com/pytorch/executorch.git third-party/executorch
+git clone -b release/0.6 https://github.com/pytorch/executorch.git third-party/executorch --depth 1 --recurse-submodules --shallow-submodules
 cd third-party/executorch
-git submodule update --init
 
-# Create a conda environment and install requirements.
+# Create either a Python virtual environment:
+python3 -m venv .venv && source .venv/bin/activate && pip install --upgrade pip
+
+# Or a Conda environment:
 conda create -yn executorch python=3.10.0
 conda activate executorch
+
+# Install requirements
 ./install_executorch.sh
 
 cd ../..
@@ -78,9 +82,8 @@ pyenv activate executorch
 
 # Clone the ExecuTorch repository and submodules.
 mkdir third-party
-git clone -b release/0.4 https://github.com/pytorch/executorch.git third-party/executorch
+git clone -b release/0.6 https://github.com/pytorch/executorch.git third-party/executorch --depth 1 --recurse-submodules --shallow-submodules
 cd third-party/executorch
-git submodule update --init
 
 # Install requirements.
 PYTHON_EXECUTABLE=python ./install_executorch.sh