Error in defining top level classes in the knowledge_base tutorial

[Sushant-Chavan]

In the knowledge_base tutorial, while establishing the Domestic ontology, it is mentioned that the top-level classes are the Object and Room. However at a later part, the Room class is actually defined as a subclass of Location class. Hence, there needs to be an update to the notebook that describes the Object and Location as the top-level classes.

• Version used (branch/commit): master/09b6651