Document jsDoc annotation for a parameter that's a class constructor.

JSDoc-support-in-JavaScript.md

@@ -135,6 +135,14 @@ let myArrow = x => x * x;
 var sfc = (test) => <div>{test.a.charAt(0)}</div>;
 
 
+/**
+ * A parameter can be a class constructor.
+ *
+ * @param {{new(...args: any[]): Object}} C - The class to register
+ */
+function registerClass(C) {}
+
+
 
 // === Below forms are not supported ===