8013541: Revise javadoc for Executable.getAnnotatedReturnType()

Reviewed-by: abuckley, darcy

src/share/classes/java/lang/reflect/Executable.java

@@ -486,8 +486,8 @@ public abstract class Executable extends AccessibleObject
     }
 
     /**
-     * Returns an AnnotatedType object that represents the potentially
-     * annotated return type of the method/constructor represented by this
+     * Returns an AnnotatedType object that represents the use of a type to
+     * specify the return type of the method/constructor represented by this
      * Executable.
      *
      * If this Executable represents a constructor, the AnnotatedType object