Fix typo in generated Yoga classes

Reviewed By: emilsjolander

Differential Revision: D4416273

fbshipit-source-id: fa3f87b86560121e1186cdc0ee295eb052fb3a97

java/com/facebook/yoga/YogaExperimentalFeature.java

@@ -30,7 +30,7 @@ public enum YogaExperimentalFeature {
     switch (value) {
       case 0: return ROUNDING;
       case 1: return WEB_FLEX_BASIS;
-      default: throw new IllegalArgumentException("Unkown enum value: " + value);
+      default: throw new IllegalArgumentException("Unknown enum value: " + value);
     }
   }
 }