fix: update node and npm versions for gen 1 docs (#7731)

Author: israx

src/fragments/lib/project-setup/native_common/prereq/common_header.mdx

@@ -1,5 +1,5 @@
 Before you begin, make sure you have the following installed:
 
-- [Node.js](https://nodejs.org/) v14.x or later
-- [npm](https://www.npmjs.com/get-npm) v6.14.4 or later
+- [Node.js](https://nodejs.org/) v16.x or later
+- [npm](https://www.npmjs.com/get-npm) v7.x or later
 - [git](https://git-scm.com/) v2.14.1 or later