Fix incorrect file references in TypeScript templates

[bigmasonwang]

When I was creating a new Rails app with Inertia React, I noticed the HMR instruction text in the TypeScript templates points to incorrect file paths:

• InertiaExample.tsx said to edit index.jsx, but the generated file is index.tsx

Also

• InertiaExample.ts.vue said to edit index.ts.vue, but per frameworks.yml, the generated file is index.vue

First contribution here, happy to make any changes if needed 😀

[skryukov]

Great finding, thanks @bigmasonwang!

Test failing bc of bundler 4, I have it fixed in #299, so no worries.