Remove docblock util from `@fb-tools/transformer`

Summary: Changelog: [Internal]

Reviewed By: motiz88

Differential Revision: D21718525

fbshipit-source-id: 38f44b45f30db71658fa969cd8bcf44638cb4ea7

Libraries/Animated/src/AnimatedImplementation.js

@@ -6,7 +6,6 @@
  *
  * @flow
  * @format
- * @preventMunge
  */
 
 'use strict';