Make minor updates to LLM guide setup instructions

Author: GregoryComer

docs/source/llm/getting-started.md

@@ -15,8 +15,9 @@
 ## Prerequisites
 
 To follow this guide, you'll need to clone the ExecuTorch repository and install dependencies. 
-ExecuTorch requires Python 3.10, as well as  This example uses
-conda to manage the Python environment. 
+ExecuTorch recommends Python 3.10 and the use of Conda to manage your environment. Conda is not
+required, though be aware that you may need to replace the use of python/pip with python3/pip3
+depending on your environment.
 
 ::::{tab-set}
 :::{tab-item} conda
@@ -57,7 +58,7 @@ eval "$(pyenv virtualenv-init -)"
 mkdir et-nanogpt
 cd et-nanogpt
 
-pyenv install 3.10
+pyenv install -s 3.10
 pyenv virtualenv 3.10 executorch
 pyenv activate executorch
 
@@ -68,8 +69,8 @@ cd third-party/executorch
 git submodule update --init
 
 # Install requirements.
-pip3 install cmake zstd
-./install_requirements.sh
+pip install cmake zstd
+PYTHON_EXECUTABLE=python ./install_requirements.sh
 
 cd ../..
 ```