add :py:func: directive

Author: mdeceglie

docs/sphinx/source/changelog/pending.rst

@@ -5,4 +5,4 @@ v3.0.0 (December XX, 2024)
 
 Bug fixes
 ---------
-* Set marker linewidth to zero in `rdtools.plotting.degradation_summary_plots` (:pull:`433`)
+* Set marker linewidth to zero in :py:func:`~rdtools.plotting.degradation_summary_plots` (:pull:`433`)