prefer-node-protocol: Mention Node.js version support in docs (#1874)

Author: bmish

docs/rules/prefer-node-protocol.md

@@ -9,6 +9,12 @@
 
 When importing builtin modules, it's better to use the [`node:` protocol](https://nodejs.org/api/esm.html#node-imports) as it makes it perfectly clear that the package is a Node.js builtin module.
 
+Note that Node.js support for this feature began in:
+
+> v16.0.0, v14.18.0 (`require()`)
+>
+> v14.13.1, v12.20.0 (`import`)
+
 ## Fail
 
 ```js