fix typo, improve wording for QHE example

content/index.txt

@@ -82,12 +82,13 @@ Quantum Hall effect
    .. image:: qhe-plateaus.png
 
 One of the most common applications of Kwant is to calculate the conductance of
-a nonoelectronic system.  The plot on the left shows the conductance through a
+a nanoelectronic system.  The plot on the left shows the conductance through a
 2-d electron gas as a function of magnetic flux.  The quantization of
 conductance that is visible (plateaus) is the hallmark of the quantum Hall
-effect.  The third plateau around 1 / Φ = 40 does not develop due to a
-constriction in the system that leads to backscattering.  The situation at this
-value of magnetic field is shown on the right.
+effect.  The third plateau does not develop due to a constriction in the system
+that leads to backscattering.  The scattering wave function from the left lead
+at magnetic field strength corresponding to the middle of the third QHE plateau
+is shown on the right.
 
 Taken from example 6 of the `Kwant paper
 <http://downloads.kwant-project.org/doc/kwant-paper.pdf>`_.