## What changes were proposed in this pull request?

SPARK-13817 (PR #11656) replaces `DataFrame` with `Dataset` from Java. This PR fixes the remaining broken links and sample Java code in `package-info.java`. As a result, it will update the following Javadoc.

* http://spark.apache.org/docs/latest/api/java/org/apache/spark/ml/attribute/package-summary.html
* http://spark.apache.org/docs/latest/api/java/org/apache/spark/ml/feature/package-summary.html

## How was this patch tested?

Manual.

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #11675 from dongjoon-hyun/replace_dataframe_with_dataset_in_javadoc.