Docs: Use npm in favor of yarn for consistency. [skip ci]
@@ -602,7 +602,7 @@ index c57e371..04fc9fe 100644
Once you changed the `src/ckeditor.js` and `webpack.config.js` files it is time to rebuild the build:
```bash
-yarn run build
+npm run build
```
Finally, when webpack finishes compiling your super build, you can change the `samples/index.html` file to test both editors: