docs: efl: document missing structs

src/lib/efl/interfaces/efl_animator.eo

@@ -1,6 +1,7 @@
 import eina_types;
 
 struct Efl.Event.Animator_Tick {
+   [[EFL event animator tick data structure]]
    update_area: Eina.Rectangle; [[Area of the canvas that will be pushed to screen.]]
 }
 

src/lib/efl/interfaces/efl_model.eo

@@ -1,4 +1,5 @@
 struct Efl.Model.Property_Event {
+     [[EFL model property event data structure]]
      changed_properties: array<string>; [[List of changed properties]]
      invalidated_properties: array<string>; [[Removed properties identified by name]]
 }