[RELEASE] Update references to release/0.4 (#5448)

Author: lucylq

docs/source/llm/getting-started.md

@@ -43,7 +43,7 @@ cd et-nanogpt
 
 # Clone the ExecuTorch repository and submodules.
 mkdir third-party
-git clone -b release/0.2 https://github.com/pytorch/executorch.git third-party/executorch
+git clone -b release/0.4 https://github.com/pytorch/executorch.git third-party/executorch
 cd third-party/executorch
 git submodule update --init
 
@@ -77,7 +77,7 @@ pyenv activate executorch
 
 # Clone the ExecuTorch repository and submodules.
 mkdir third-party
-git clone -b release/0.2 https://github.com/pytorch/executorch.git third-party/executorch
+git clone -b release/0.4 https://github.com/pytorch/executorch.git third-party/executorch
 cd third-party/executorch
 git submodule update --init
 

examples/demo-apps/apple_ios/ExecuTorchDemo/README.md

@@ -44,7 +44,7 @@ Follow the [Setting Up ExecuTorch](https://pytorch.org/executorch/stable/getting
 tutorial to configure the basic environment:
 
 ```bash
-git clone https://github.com/pytorch/executorch.git -b release/0.3 --recursive
+git clone https://github.com/pytorch/executorch.git -b release/0.4 --recursive
 cd executorch
 
 python3 -m venv .venv && source .venv/bin/activate