fix whitespace in sunburst example

Author: janosh

doc/python/sunburst-charts.md

@@ -48,7 +48,7 @@ data = dict(
     parent=["", "Eve", "Eve", "Seth", "Seth", "Eve", "Eve", "Awan", "Eve" ],
     value=[10, 14, 12, 10, 2, 6, 6, 4, 4])
 
-fig =px.sunburst(
+fig = px.sunburst(
     data,
     names='character',
     parents='parent',