Update doc/python/sunburst-charts.md
Update doc/python/sunburst-charts.md

Co-Authored-By: Nicolas Kruchten <418d940643b1975d62234ee01246ad4b58904184@plot.ly>
plotly/python-api,plotly/python-api,plotly/plotly.py,plotly/plotly.py,plotly/plotly.py,plotly/python-api