ecore_timer: document properties

Make sure that we actually document the property itself and not only the
property methods.

src/lib/ecore/ecore_timer.eo

@@ -14,6 +14,7 @@ class Ecore.Timer (Eo.Base)
    eo_prefix: ecore_obj_timer;
    methods {
       @property interval {
+         [[Interval the timer ticks on.]]
          set {
             [[Change the interval the timer ticks off. If set during
               a timer call, this will affect the next interval.
@@ -27,6 +28,7 @@ class Ecore.Timer (Eo.Base)
          }
       }
       @property pending {
+         [[Pending time regarding a timer.]]
          get {
             [[Get the pending time regarding a timer.]]
             return: double;