Fix a typo in the docstring of OderedLogistic (#6611)

Author: NathanielF

pymc/distributions/discrete.py

@@ -1572,7 +1572,7 @@ class OrderedLogistic:
         # Ordered logistic regression
         with pm.Model() as model:
             cutpoints = pm.Normal("cutpoints", mu=[-1,1], sigma=10, shape=2,
-                                  transform=pm.distributions.transforms.ordered)
+                                  transform=pm.distributions.transforms.univariate_ordered)
             y_ = pm.OrderedLogistic("y", cutpoints=cutpoints, eta=x, observed=y)
             idata = pm.sample()