Adding comment for code clarification (#7856)

Co-authored-by: Derek Bailey <derekbailey@google.com>
diff --git a/dart/test/monster_test.fbs b/dart/test/monster_test.fbs
index b40ecf5..8a124f2 100644
--- a/dart/test/monster_test.fbs
+++ b/dart/test/monster_test.fbs
@@ -59,6 +59,8 @@
   test3:Test;
 }
 
+// Stats for monster
+
 struct Ability {
   id:uint(key);
   distance:uint;