Finish addressing @emersion's comments

include/wlr/types/wlr_relative_pointer_v1.h

@@ -27,7 +27,7 @@
 struct wlr_relative_pointer_manager_v1 {
 	struct wl_global *global;
 	struct wl_list resources; // wl_resource_get_link()
-	struct wl_list relative_pointers;
+	struct wl_list relative_pointers; // wlr_relative_pointer_v1::link
 
 	struct {
 		struct wl_signal destroy;
@@ -68,6 +68,9 @@ struct wlr_relative_pointer_manager_v1 *wlr_relative_pointer_manager_v1_create(
 void wlr_relative_pointer_manager_v1_destroy(
 	struct wlr_relative_pointer_manager_v1 *relative_pointer_manager);
 
+/**
+ * Send a relative motion event to the seat with the same wl_pointer as relative_pointer
+ */
 void wlr_relative_pointer_v1_send_relative_motion(
 	struct wlr_relative_pointer_v1 *relative_pointer, uint64_t time_msec,
 	double dx, double dy, double dx_unaccel, double dy_unaccel);