client-core: Add missing line breaks

Signed-off-by: Yong Bakos <ybakos@humanoriented.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

src/wayland-client-core.h

@@ -150,10 +150,12 @@ wl_proxy_marshal_constructor_versioned(struct wl_proxy *proxy,
 				       const struct wl_interface *interface,
 				       uint32_t version,
 				       ...);
+
 struct wl_proxy *
 wl_proxy_marshal_array_constructor(struct wl_proxy *proxy,
 				   uint32_t opcode, union wl_argument *args,
 				   const struct wl_interface *interface);
+
 struct wl_proxy *
 wl_proxy_marshal_array_constructor_versioned(struct wl_proxy *proxy,
 					     uint32_t opcode,