Dash Bio Python components require docstrings formatted like those from other libraries

[shammamah-zz]

As of plotly/dash#782, the docstrings for components' props now look like this:

[prop name] ([type]; [required/optional/default [default value]]): [prop description]

The Clustergram, ManhattanPlot, and VolcanoPlot docstrings should be fixed accordingly.