"add_supported_class" method in doc_writer.py dose not take collection as argument.

[Purvanshsingh]

In the Usage page of the Documentation (http://www.hydraecosystem.org/01-Usage) the "add_supported_class" method contains two arguments apidoc.add_supported_class(class_, collection=True) where as in the doc_writer.py there in no such collection agrument required.

[Akash-Kumar-Sen]

I want to work on this issue!