update contact_kwargs in examples

Author: alejoe91

examples/ex_12_plot_values.py

@@ -34,7 +34,7 @@
 
 fig, ax = plt.subplots()
 poly, poly_contour = plot_probe(probe, contacts_values=values,
-            cmap='jet', ax=ax, contacts_kargs={'alpha' : 1},  title=False)
+            cmap='jet', ax=ax, contact_kwargs={'alpha' : 1},  title=False)
 poly.set_clim(-2, 2)
 fig.colorbar(poly)