message: docs(server): fix Response::set_status() documentation
diff: @@ -35,7 +35,7 @@ impl<'a> Response<'a> {
  #[inline]
  pub fn headers_mut(&mut self) -> &mut header::Headers { &mut self.head.headers }
  - /// Get a mutable reference to the status.
  + /// Set the status of this response.
  #[inline]
  pub fn set_status(&mut self, status: StatusCode) {
  self.head.subject = status;
  