[css-transitions-1] Remove duplicate animation type values

Author: cdoublev

css-transitions-1/Overview.bs

@@ -387,7 +387,6 @@ Value Definitions {#values}
         Value: <<single-transition>>#
         Applies to: all elements
         Inherited: no
-        Animatable: no
         Percentages: N/A
         Animation type: not animatable
       </pre>