polish(create-docusaurus): add comment in config to mention different…

… ways to declare config + doc link (#8944)

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

packages/create-docusaurus/templates/classic/docusaurus.config.js

@@ -1,5 +1,8 @@
 // @ts-check
-// Note: type annotations allow type checking and IDEs autocompletion
+// `@type` JSDoc annotations allow editor autocompletion and type checking
+// (when paired with `@ts-check`).
+// There are various equivalent ways to declare your Docusaurus config.
+// See: https://docusaurus.io/docs/api/docusaurus-config
 
 const lightCodeTheme = require('prism-react-renderer/themes/github');
 const darkCodeTheme = require('prism-react-renderer/themes/dracula');