Update src/sage/modules/torsion_quadratic_module.py

Author: alexjbest

src/sage/modules/torsion_quadratic_module.py

@@ -850,7 +850,7 @@ def orthogonal_group(self, gens=None, check=False):
             [1 0 0]
             [0 0 1]
 
-        We compute the kernel of the action of the orthogonal group of `L` on the discriminant group.::
+        We compute the kernel of the action of the orthogonal group of `L` on the discriminant group::
 
             sage: L = IntegralLattice('A4')
             sage: O = L.orthogonal_group()