Email Service overview shows unsupported `"email": [{"name":"EMAIL_HANDLER"}]` Wrangler config

### Existing documentation URL(s)

- https://developers.cloudflare.com/email-service/

### What changes are you suggesting?

The Email Service overview currently shows this Wrangler configuration:

```jsonc
// Email routing
"email": [
{
"name": "EMAIL_HANDLER"
}
]
```

However, inbound Email Routing is handled through the Worker's exported email() handler, and the current Wrangler schema/configuration reference does not appear to define a top-level email binding/config field.

The newer Wrangler-managed routing configuration appears to use addresses instead.

Is the email example stale or incorrect? If so, it should probably be removed or replaced with an addresses example once that feature is documented.

### Additional information

_No response_