message: docs(example): add a get query method to params example
diff: @@ -68,6 +68,29 @@ async fn param_example(req: Request<Body>) -> Result<Response<Body>, hyper::Erro
  let body = format!("Hello {}, your number is {}", name, number);
  Ok(Response::new(body.into()))
  }
  + (&Method::GET, "/get") => {
  + let query = if let Some(q) = req.uri().query() {
  + q
  + } else {
  + return Ok(Response::builder()
  + .status(StatusCode::UNPROCESSABLE_ENTITY)
  + .body(MISSING.into())
  + .unwrap());
  + };
  + let params = form_urlencoded::parse(query.as_bytes())
  + .into_owned()
  + .collect::<HashMap<String, String>>();
  + let page = if let Some(p) = params.get("page") {
  + p
  + } else {
  + return Ok(Response::builder()
  + .status(StatusCode::UNPROCESSABLE_ENTITY)
  + .body(MISSING.into())
  + .unwrap());
  + };
  + let body = format!("You requested {}", page);
  + Ok(Response::new(body.into()))
  + }
  _ => Ok(Response::builder()
  .status(StatusCode::NOT_FOUND)
  .body(Body::empty())
  