doc: composition-api is only required for Vue <= 2.6.x (#1535)

Author: greenbourne277

packages/docs/getting-started.md

@@ -9,7 +9,7 @@ npm install pinia
 ```
 
 :::tip
-If your app is using Vue 2, you also need to install the composition api: `@vue/composition-api`. If you are using Nuxt, you should follow [these instructions](/ssr/nuxt.md).
+If your app is using Vue <= 2.6.x, you also need to install the composition api: `@vue/composition-api`. If you are using Nuxt, you should follow [these instructions](/ssr/nuxt.md).
 :::
 
 If you are using the Vue CLI, you can instead give this [**unofficial plugin**](https://github.com/wobsoriano/vue-cli-plugin-pinia) a try.