Remove errroneous comma in SVG path

This is only a minor mistake, but slightly misleading because for a moment I thought this example showed how to draw only some but not all edges.

Author: SeanMcCarren

doc/python/shapes.md

@@ -565,7 +565,7 @@ fig.update_layout(
         # filled Polygon
         dict(
             type="path",
-            path=" M 3,7 L2,8 L2,9 L3,10, L4,10 L5,9 L5,8 L4,7 Z",
+            path=" M 3,7 L2,8 L2,9 L3,10 L4,10 L5,9 L5,8 L4,7 Z",
             fillcolor="PaleTurquoise",
             line_color="LightSeaGreen",
         ),