Update Hono example code and documentation links for Vercel Backend Frameworks

Hi Vercel team,

I hope this message finds you well.

I've noticed that Hono is now officially supported as a backend framework on Vercel, which is fantastic news for the Hono community! However, it seems there's a small but significant point that could cause confusion for users trying to get started with Hono on Vercel:

Problem: Incorrect Documentation Link in framework-boilerplates/hono/src/index.ts

• The current Hono example code located at framework-boilerplates/hono/src/index.ts (https://github.com/vercel/examples/blob/main/framework-boilerplates/hono/src/index.ts) references an outdated documentation link.
• Specifically, it links to https://vercel.com/docs/frameworks/hono.

Proposed Change: Update to the Correct Backend Frameworks URL

• This Pull Request updates the documentation link within framework-boilerplates/hono/src/index.ts.
• Old Link: https://vercel.com/docs/frameworks/hono
• New Link: https://vercel.com/docs/frameworks/backend/hono

Why this change is needed (Impact for Users):
Hono is now officially classified and supported as a backend framework on Vercel, and the corresponding documentation has been moved to the /backend/hono path. The old URL may lead users to outdated, less relevant information, or even a broken page in the future.

By updating this link, we ensure that:

• Developers using this Hono example are directed to the proper, up-to-date documentation for deploying Hono applications on Vercel.
• The onboarding experience for new Hono users on Vercel is smoother and more efficient, preventing potential frustration.

This small correction significantly improves the user experience by guiding developers to the most accurate and relevant resources from the start.

Thanks for your time and consideration!

Best regards,

https://github.com/MAA39

Open framework-boilerplates/hono/src/index.ts and inspect the documentation URL in the Hono example. Confirm that the old /frameworks/hono link is used, then update it to /frameworks/backend/hono; the work is done when the example points to the current backend-framework documentation.