LibJS: Remove implicit wrapping/unwrapping of completion records

This is an editorial change in the ECMA-262 spec, with similar changes
in some proposals.

See:
- 7575f74
- df899eb
- 9eb5a12
- c81f527

Userland/Libraries/LibJS/SyntheticModule.cpp

@@ -67,8 +67,7 @@ ThrowCompletionOr<void> SyntheticModule::link(VM& vm)
         environment->initialize_binding(global_object, export_name, js_undefined());
     }
 
-    // 6. Return undefined.
-    // Note: This return value is never visible to the outside so we use void.
+    // 6. Return unused.
     return {};
 }