fix(pygal): update area-basic to trigger CI on correct file

The previous attempt deleted the duplicate file from the wrong location
(plots/pygal/line/area-basic) but CI was only seeing the deleted file
in the diff. This update modifies the correct file so CI will test it.

Author: github-actions[bot]

plots/pygal/area/area-basic/default.py

@@ -7,7 +7,7 @@
 from pygal.style import Style
 
 
-# Data
+# Data - monthly sales example
 months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]
 sales = [100, 150, 130, 180, 200, 220]