Minor correction

Name of the window around "ideal" line plot should be "ideal" but is instead marked as "fair".

Author: ashwin-nayak

doc/python/line-charts.md

@@ -384,7 +384,7 @@ fig.add_trace(go.Scatter(
     fillcolor='rgba(231,107,243,0.2)',
     line_color='rgba(255,255,255,0)',
     showlegend=False,
-    name='Fair',
+    name='Ideal',
 ))
 fig.add_trace(go.Scatter(
     x=x, y=y1,