😒 chore: Upgrade docs.

Author: make-github-pseudonymous-again

doc/manual/overview.md

@@ -0,0 +1 @@
+# Overview

doc/manual/usage.md

@@ -1,11 +1,11 @@
 # Usage
 
 The code needs a ES2015+ polyfill to work, for example
-[babel-polyfill](https://babeljs.io/docs/usage/polyfill).
+[@babel/polyfill](https://babeljs.io/docs/usage/polyfill).
 ```js
-require( 'babel-polyfill' ) ;
+require( '@babel/polyfill' ) ;
 // or
-import 'babel-polyfill' ;
+import '@babel/polyfill' ;
 ```
 
 Then