fix test docstring

Author: j-c-c

tests/test_commonline_utils.py

@@ -191,11 +191,11 @@ def test_g_sync(symmetry):
 @pytest.mark.parametrize("symmetry", ["C3", "C4", "D3", "D4", "T", "O"])
 def test_compare_rots_sym(symmetry):
     """
-    This method find the mean squared error between all pairs of rotations
-    taking into account each rotation being multiplied by an arbitrary
-    symmetry group element. In this test we check that a set of rotations
-    multiplied by random symmetry group elements gives a zero MSE when compared
-    to the original set.
+    Thwe compare_rots_sym method finds the mean squared error between all pairs
+    of relative rotations, Ri.T @ Rj, taking into account each rotation being
+    multiplied by an arbitrary symmetry group element, ie. g @ Ri. In this test
+    we check that a set of rotations multiplied by random symmetry group elements
+    gives a zero MSE when compared to the original set.
     """
     n = 100
     dtype = np.float64