Updated documentation for Stream.write, data->trace.
Updated documentation for Stream.write, data->trace.

'trace' is clearer than 'data', since it must be a dict obj.

plotly/plotly.py,ee-in/python-api,plotly/python-api,plotly/python-api,plotly/plotly.py,ee-in/python-api,plotly/plotly.py,ee-in/python-api,plotly/python-api