Fix module-class.d.ts incorrect export as namespace syntax (#3302)

Author: FoundTheWOUT

packages/documentation/copy/en/declaration-files/templates/module-class.d.ts.md

@@ -50,7 +50,7 @@ To handle both importing via UMD and modules:
  *~ loaded outside a module loader environment, declare that global here.
  *~ Otherwise, delete this declaration.
  */
-export as namespace "super-greeter";
+export as namespace myClassLib;
 
 /*~ This declaration specifies that the class constructor function
  *~ is the exported object from the file