Update required node version

Since nuxt seems not work on node v < 16 -> update documentation

https://github.com/nuxt/framework/issues/8407
https://github.com/nuxt/framework/issues/8335

docs/content/1.getting-started/2.installation.md

@@ -23,7 +23,7 @@ Before getting started, please make sure you have installed the recommended setu
   * Either enable [**Take Over Mode**](https://vuejs.org/guide/typescript/overview.html#volar-takeover-mode) (recommended)
   * ... or add **TypeScript Vue Plugin (Volar)** 👉 [[Download](https://marketplace.visualstudio.com/items?itemName=Vue.vscode-typescript-vue-plugin)]
 
-<sup>*</sup> If you already have Node.js installed, check with `node --version` that you are using version 14.16 or above 16.11.
+<sup>*</sup> If you already have Node.js installed, check with `node --version` above 16.11.
 
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