chore: Add documenting ref to StrictReactNode type

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/utility-features/utilities/src/isReactNode.ts

@@ -6,6 +6,8 @@
 import React from "react";
 import { isObject } from "./type-narrowing";
 
+// ref: https://changelog.com/posts/the-react-reactnode-type-is-a-black-hole
+
 export type StrictReactFragment =
   | {
       key?: string | number | null;