message: correction of typo in usr.rst
diff: @@ -64,8 +64,8 @@ An index of -1 represents the diagonal.
  message_cost = "Wasserstein distance value = %.2f" %cost
  print(message_cost)
  - dgm1_to_diagonal = matchings[matchings[:,0] == -1, 1]
  - dgm2_to_diagonal = matchings[matchings[:,1] == -1, 0]
  + dgm1_to_diagonal = matchings[matchings[:,1] == -1, 0]
  + dgm2_to_diagonal = matchings[matchings[:,0] == -1, 1]
  off_diagonal_match = np.delete(matchings, np.where(matchings == -1)[0], axis=0)
  for i,j in off_diagonal_match:
  