Moves python figure to below exercise

docs/12_band_structures_in_higher_dimensions.md

@@ -242,7 +242,10 @@ We limit ourselves to a single orbital per atom and only nearest-neighbour inter
 
     What Fermi surface shape would this model have if the atoms are monovalent?
 
-    ```python
+5. What Fermi surface shape would it have if the number of electrons per atom is much smaller than 1?
+
+
+```python
     def dispersion2D(N=100, kmax=pi, e0=2):
         
         # Define matrices with wavevector values
@@ -262,9 +265,7 @@ We limit ourselves to a single orbital per atom and only nearest-neighbour inter
         plt.yticks((-pi, 0 , pi),('$-\pi/a$','$0$','$\pi/a$'), fontsize=17)
 
     dispersion2D()
-    ```
-
-5. What Fermi surface shape would it have if the number of electrons per atom is much smaller than 1?
+```
 
 ### Exercise 3: Nearly-free electron model in 2D
 _(based on exercise 15.4 of the book)_