Add guidance for using wrangler types with Hono (--env-interface required)

[niklasfjeldberg]

The Hono docs don't mention that Hono users need --env-interface to avoid a naming collision.

wrangler types generates a global interface Env by default. Hono also exports its own Env type ({ Bindings?: {}; Variables?: {} }). When a Hono app uses the generated Env as Bindings, TypeScript can resolve to the wrong Env, causing all binding properties to be missing.

The fix is straightforward — use a different interface name:

wrangler types --env-interface CloudflareBindings

const app = new Hono<{ Bindings: CloudflareBindings }>()

The Hono getting started docs at hono.dev only show manually defining bindings types, so a mention of wrangler types --env-interface there would also help.