Fix typos reported by Tobias Bautze

doc/source/images/tutorial3a.py

@@ -45,7 +45,7 @@ def plot_bandstructure(flead, momenta):
     energy_list = [flead.energies(k) for k in momenta]
 
     pylab.plot(momenta, energy_list)
-    pylab.xlabel("momentum [in untis of (lattice constant)^-1]",
+    pylab.xlabel("momentum [in units of (lattice constant)^-1]",
                  fontsize=latex.mpl_label_size)
     pylab.ylabel("energy [in units of t]",
                  fontsize=latex.mpl_label_size)

doc/source/tutorial/tutorial1.rst

@@ -165,7 +165,8 @@ subbands that increases with energy.
      `~kwant.builder.Builder` automatically adds the other
      direction of the hopping such that the resulting system is Hermitian.
 
-     It however does not hurt the other direction of the hopping, too::
+     However, it does not hurt to define the opposite direction of hopping as
+     well.
 
          sys[(1, 0), (0, 0)] = - t
          sys[(0, 0), (1, 0)] = - t.conj()

doc/source/tutorial/tutorial2.rst

@@ -398,7 +398,7 @@ period of one flux quantum.
     by providing an alternative starting point from where
     the lead is traced back::
 
-        sys.attach_lead(lead1, (0, 0))
+        sys.attach_lead(lead1, lat(0, 0))
 
     starts the trace-back in the middle of the ring, resulting
     in the lead being attached to the inner circle:

examples/tutorial3a.py

@@ -42,7 +42,7 @@ def plot_bandstructure(flead, momenta):
     energy_list = [flead.energies(k) for k in momenta]
 
     pylab.plot(momenta, energy_list)
-    pylab.xlabel("momentum [in untis of (lattice constant)^-1]")
+    pylab.xlabel("momentum [in units of (lattice constant)^-1]")
     pylab.ylabel("energy [in units of t]")
     pylab.show()