Make a complete example of onError handling in the docs

[Soviut]

What is the feature you are proposing?

The docs for the app.onError handling have an incomplete example. https://hono.dev/api/exception#handling-httpexception

app.onError((err, c) => {
  if (err instanceof HTTPException) {
    // Get the custom response
    return err.getResponse()
  }
  //...
})

It would be helpful if the example was expanded where the // ... is to show how to pass through the err if it is not an HTTPException.

[fzn0x]

The section itself was described only to handle httpexception, if it is not an HTTPException, you can check here:

https://hono.dev/api/hono#error-handling

[Soviut]

The problem is I want to always use HTTPException because it triggers app.onError() which I use for logging to Sentry. Setting the status code does not do this.