gpui: Update "Getting Started" to include macOS setup (#17316)

This PR updates the GPUI docs to mention how to install XCode for Metal
support.

Supersedes https://github.com/zed-industries/zed/pull/16820.

Release Notes:

- N/A
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Marshall Bowers 2024-09-03 13:26:11 -04:00 committed by GitHub
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@ -23,7 +23,7 @@ Clone down the [Zed repository](https://github.com/zed-industries/zed).
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
```
* Install the Rust wasm toolchain:
- Install the Rust wasm toolchain:
```sh
rustup target add wasm32-wasi