update formatting

Author: WilliamHYZhang

docs/add_dataset.md

@@ -558,8 +558,11 @@ for more information.
 
 Send the pull request for review. When creating the pull request, please use the
 `add_dataset` template, which provides a guide and a checklist for adding a
-dataset to TFDS. To use the template, simply add `?template=add_dataset.md` at
-the end of the link when creating the pull request. For example, 
+dataset to TFDS.
+
+To use the template, simply add `?template=add_dataset.md` at
+the end of the link when creating the pull request. For example:
+
 `https://github.com/tensorflow/datasets/compare/master...<username>:<branch>?template=add_dataset.md`