Fresh setup m1 (#3759) (#3791)

Summary: Pull Request resolved: #3759

Reviewed By: mcr229

Differential Revision: D57887358

Pulled By: guangy10

fbshipit-source-id: 8e63de15fafb498b05828440ac8d8c51204e8042
(cherry picked from commit 26daed7)

Co-authored-by: Guang Yang <[email protected]>

Author: pytorchbot

docs/source/getting-started-setup.md

@@ -92,6 +92,7 @@ portability details.
 
    # Install ExecuTorch pip package and its dependencies, as well as
    # development tools like CMake.
+   # If developing on a Mac, make sure to install the Xcode Command Line Tools first.
    ./install_requirements.sh
    ```
 
@@ -201,10 +202,10 @@ To set up `Buck2`, You will need the following prerequisits for this section:
   version of the buck2 prelude used by the ExecuTorch repo.
 
 Configure Buck2 by decompressing with the following command (filename depends
-   on your system):
+   on your system, and the location of the binary can be different):
 
    ```bash
-   # For example, buck2-x86_64-unknown-linux-musl.zst or buck2-aarch64-apple-darwin.zst
+   # For example, buck2-x86_64-unknown-linux-musl.zst for Linux, or buck2-aarch64-apple-darwin.zst for Mac with Apple silicon.
    zstd -cdq buck2-DOWNLOADED_FILENAME.zst > /tmp/buck2 && chmod +x /tmp/buck2
    ```
 
@@ -217,6 +218,8 @@ After the installation, you can run the `add.pte` program by following `buck2` c
 /tmp/buck2 run //examples/portable/executor_runner:executor_runner -- --model_path add.pte
 ```
 
+Note that the first run may take a while as it will have to complie the kernels from sources
+
 ## Next Steps
 
 Congratulations! You have successfully exported, built, and run your first