xdg_activation: Update doc-test
//! ```no_run
//! # extern crate wayland_server;
//! #
-//! use wayland_server::protocol::wl_surface::WlSurface;
+//! use wayland_server::{protocol::wl_surface::WlSurface, DisplayHandle};
//! use smithay::{
//! delegate_xdg_activation,
//! wayland::xdg_activation::{XdgActivationHandler, XdgActivationState, XdgActivationToken, XdgActivationTokenData}
//!
//! fn request_activation(
//! &mut self,
+//! dh: &DisplayHandle,
//! token: XdgActivationToken,
//! token_data: XdgActivationTokenData,
//! surface: WlSurface
