Fix outdated reference to emotion package in docs (#2608)

Author: srmagura

docs/install.mdx

@@ -2,7 +2,7 @@
 title: 'Install'
 ---
 
-There are lots of ways to use Emotion, if you're using React, the easiest way to get started is to use the [`@emotion/react` package](/packages/react). If you're not using React, you should use [the `emotion` package](#vanilla).
+There are lots of ways to use Emotion, if you're using React, the easiest way to get started is to use the [`@emotion/react` package](/packages/react). If you're not using React, you should use [the `@emotion/css` package](#vanilla).
 
 ```bash
 yarn add @emotion/react