[GitHub] [flink] lamber-ken commented on issue #6647: [hotfix][docs] Fix error html tag in batch index documentatition

[GitHub]

Old `DataSet Transformations documents` has some error html tag.

[flink-1.4-dataset-transformations-scala](https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/batch/)
[flink-1.5-dataset-transformations-scala](https://ci.apache.org/projects/flink/flink-docs-release-1.5/dev/batch/)
[flink-1.6-dataset-transformations-scala](https://ci.apache.org/projects/flink/flink-docs-release-1.6/dev/batch/)

![image](https://user-images.githubusercontent.com/20113411/44969802-56667f80-af81-11e8-9f82-2285fe865c99.png)
![image](https://user-images.githubusercontent.com/20113411/44969838-7b5af280-af81-11e8-9777-e85f41f22d1d.png)




[ Full content available at: https://github.com/apache/flink/pull/6647 ]
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