Added toctree link to singlepoint dataset example
Exploring the Datasets
======================
+.. toctree::
+ :maxdepth: 1
+ :caption: Example
+ :hidden:
+
+ collection-dataset-example.ipynb
+
The :class:`Dataset <qcportal.collections.Dataset>` collection represents a table whose rows correspond to
:class:`Molecules <qcportal.models.Molecule>` and whose columns correspond to properties.
Columns may either result from QCFractal-based calculations or be contributed from outside sources.
