refactor: Remove ReducedComment type

Author: tmcw

declarations/comment.js

@@ -146,9 +146,3 @@ type Kind =
   | 'namespace'
   | 'typedef'
   | 'interface';
-
-// type ReducedComment = {
-//   name: string,
-//   kind: ?Kind,
-//   scope?: ?Scope
-// };