Disambiguate super from this inheritance (#2854)

* Disambiguate `super` from `this` inheritance

If the child class inherits a function, calling it from `super` behaves identically to calling it from `this`. But by overriding the inherited definition, the example demonstrates that `super` bypasses the child’s definition and goes to the parent’s instead.

* explicitly call out local definition being bypassed

Co-authored-by: Joshua Chen <[email protected]>

---------

Co-authored-by: Joshua Chen <[email protected]>

Author: davidmcguiredesign

live-examples/js-examples/expressions/expressions-super.js

@@ -14,6 +14,11 @@ class FooBar extends Foo {
     this.index = index;
   }
 
+  // Does not get called
+  getNameSeparator() {
+    return '/';
+  }
+
   getFullName() {
     return this.name + super.getNameSeparator() + this.index;
   }