fix typo

docs/css-loading.md

@@ -30,7 +30,7 @@ npm install lightningcss --save-dev
 [Sass](https://sass-lang.com/) is supported out of the box. Just like with Lightning CSS you don't have to install Sass as a dependency, but it is recommended.
 
 ```bash
-npm install lightningcss --save-dev
+npm install sass --save-dev
 ```
 
 Note that compiled Sass is processed with LightningCSS afterwards, so if you plan on only processing scss files it is recommended to install both Lightning CSS & Sass.