message: add comment to Mutation
diff: @@ -591,6 +591,8 @@ pub struct HttpServer {
  custom_responders: HashMap<&'static str, Box<dyn Send + Fn(&Request, &HttpServer) -> Response>>,
  }
  +/// A helper struct that collects the arguments for [HttpServer::check_authorized].
  +/// Based on looking at the request, these are the fields that the authentication header should attest to.
  pub struct Mutation<'a> {
  pub mutation: &'a str,
  pub name: Option<&'a str>,
  