polish: remove FIXME

Author: simonbasle

spring-context/src/main/java/org/springframework/scheduling/annotation/ScheduledAnnotationReactiveSupport.java

@@ -41,7 +41,7 @@
  * Helper class for @{@link ScheduledAnnotationBeanPostProcessor} to support reactive cases
  * without a dependency on optional classes.
  * @author Simon Baslé
- * @since 6.1.0 //FIXME
+ * @since 6.1.0
  */
 abstract class ScheduledAnnotationReactiveSupport {