Improve macOS build guide (#19172)

- `mold` moved to `sold` long time ago.
  And https://github.com/bluewhalesystems/sold/issues/43...
- And add a step for accepting xcodebuild license

Signed-off-by: Xavier Lau <x@acg.box>

docs/src/development/macos.md

@@ -21,6 +21,7 @@ Clone down the [Zed repository](https://github.com/zed-industries/zed).
 
   ```sh
   sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
+  sudo xcodebuild -license accept
   ```
 
 - Install the Rust wasm toolchain:
@@ -35,12 +36,6 @@ Clone down the [Zed repository](https://github.com/zed-industries/zed).
   brew install cmake
   ```
 
-- (Optional) Install `mold` to speed up link times
-
-  ```sh
-  brew install mold
-  ```
-
 ## Backend Dependencies
 
 If you are developing collaborative features of Zed, you'll need to install the dependencies of zed's `collab` server: