docs: Fix installation command via Homebrew (#10416)

When I installed zed by running `brew install zed` following
`README.md`, [brimdata/zed](https://github.com/brimdata/zed) was
installed.
By running `brew install --cask zed`, zed was installed properly.
It seems like `--cask` option is needed.

### Environments:
- OS:
    - macOS 13.4
- Homebrew version: 
    ```sh
    Homebrew 4.2.17-40-gef1c54e
Homebrew/homebrew-core (git revision 0f61f2950ec; last commit
2024-04-03)
Homebrew/homebrew-cask (git revision 40c0a17ee0; last commit 2024-04-03)
    ```

Release Notes:

- N/A
This commit is contained in:
Tatsuya Kyushima 2024-04-11 22:12:23 +09:00 committed by GitHub
parent 2f616fe8eb
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@ -17,7 +17,7 @@ Support for additional platforms is on our [roadmap](https://zed.dev/roadmap):
For macOS users, you can also install Zed using [Homebrew](https://brew.sh/):
```sh
brew install zed
brew install --cask zed
```
Alternatively, to install the Preview release: