add that these are for _sharp_ regression discontinuity designs in the docstrings

Author: drbenvincent

causalpy/pymc_experiments.py

@@ -541,7 +541,7 @@ def summary(self):
 
 class RegressionDiscontinuity(ExperimentalDesign):
     """
-    A class to analyse regression discontinuity experiments.
+    A class to analyse sharp regression discontinuity experiments.
 
     :param data:
         A pandas dataframe

causalpy/skl_experiments.py

@@ -348,7 +348,7 @@ def plot(self):
 
 class RegressionDiscontinuity(ExperimentalDesign):
     """
-    A class to analyse regression discontinuity experiments.
+    A class to analyse sharp regression discontinuity experiments.
 
     :param data:
         A pandas dataframe