Module plugin template is misleading

**Expected behavior:** I followed the template exactly and it can't do what it's claiming you can do. I would expect from the template that I could extend an existing module with a new function. https://www.typescriptlang.org/docs/handbook/declaration-files/templates/module-plugin-d-ts.html **Actual behavior:** I am unable to extend the existing module with a new function. https://github.com/MCKRUZ/TS-Plugin-HW