Fix misleading ItemStreamSimpleReaderDelegate#read javadoc comment

Signed-off-by: Taeik Lim <sibera21@gmail.com>

spring-batch-plus/src/main/java/com/navercorp/spring/batch/plus/item/adapter/ItemStreamSimpleReaderDelegate.java

@@ -39,8 +39,7 @@ default void onOpenRead(@NonNull ExecutionContext executionContext) {
 	}
 
 	/**
-	 * Read each item. Invoked in {@link ItemStreamReader#open(ExecutionContext)}.
-	 *
+	 * Read each item.
 	 * @return an item to read. null if it's end of data.
 	 *         Return contract is same as {@link org.springframework.batch.item.ItemReader<T>}
 	 */