small fixes related to pr comments

Author: jpreszler

causalpy/pymc_models.py

@@ -5,10 +5,13 @@
 - LinearRegression model
 
 Models are intended to be used from inside an experiment
-class (see pymc_experiments.py). This is why the examples require some extra
+class (see `pymc_experiments.py
+<https://causalpy.readthedocs.io/en/latest/api_pymc_experiments.html>`_).
+This is why the examples require some extra
 manipulation input data, often to ensure `y` has the correct shape.
 
 """
+
 from typing import Any, Dict, Optional
 
 import arviz as az

causalpy/skl_experiments.py

@@ -298,7 +298,6 @@ class DifferenceInDifferences(ExperimentalDesign):
     Example
     --------
     >>> df = cp.load_data("did")
-    >>> seed = 42
     >>> result = cp.skl_experiments.DifferenceInDifferences(
     ...     data,
     ...     formula="y ~ 1 + group*post_treatment",