doc: fix argument name in pyplot Ellipse in plots.

doc/plot/plot_ML.py

@@ -66,7 +66,9 @@ def draw_ellipse(position, covariance, ax=None, **kwargs):
     # Draw the Ellipse
     for nsig in range(1, 4):
         ax.add_patch(
-            Ellipse(position, nsig * width, nsig * height, angle, **kwargs)
+            Ellipse(
+                position, nsig * width, nsig * height, angle=angle, **kwargs
+            )
         )