trim unwanted white spaces in demo_scattering_boundary_conditions.py

python/demo/demo_scattering_boundary_conditions/demo_scattering_boundary_conditions.py

@@ -371,8 +371,8 @@ def curl_2d(f: fem.Function):
 #
 # Cancelling $-(\nabla\times\mathbf{E}_s \times \bar{\mathbf{V}})
 # \cdot\mathbf{n}$  and $\mathbf{n} \times \nabla \times \mathbf{E}_s
-# \cdot \bar{\mathbf{V}}$ and rearrange $\left((\mathbf{n} \times \mathbf{E}_s) 
-# \times \mathbf{n}\right) \cdot \bar{\mathbf{v}}$ to $ (\mathbf{E}_s \times\mathbf{n}) 
+# \cdot \bar{\mathbf{V}}$ and rearrange $\left((\mathbf{n} \times \mathbf{E}_s)
+# \times \mathbf{n}\right) \cdot \bar{\mathbf{v}}$ to $ (\mathbf{E}_s \times\mathbf{n})
 # \cdot (\bar{\mathbf{v}} \times \mathbf{n})$ using the triple product rule $\mathbf{A}
 # \cdot(\mathbf{B} \times \mathbf{C})=\mathbf{B} \cdot(\mathbf{C} \times
 # \mathbf{A})=\mathbf{C} \cdot(\mathbf{A} \times \mathbf{B})$, we get: