Enhance documentation for cox_ph_forestplot function to clarify usage…

… of adata and summary table

ehrapy/plot/_survival_analysis.py

@@ -318,14 +318,17 @@ def cox_ph_forestplot(
     title: str | None = None,
 ):
     """Generates a forest plot to visualize the coefficients and confidence intervals of a Cox Proportional Hazards model.
-    The adata object must be populated  via the :func:`~ehrapy.tools.cox_ph` function beforehand.
+
+    The `adata` object must first be populated using the :func:`~ehrapy.tools.cox_ph` function. This function stores the summary table of the `CoxPHFitter` in the `.uns` attribute of `adata`.
+    The summary table is created when the model is fitted using the :func:`ehrapy.tl.cox_ph` function.
+    For more information on the `CoxPHFitter`, see the `Lifelines documentation <https://lifelines.readthedocs.io/en/latest/fitters/regression/CoxPHFitter.html>`_.
 
     Inspired by `zepid.graphics.EffectMeasurePlot <https://readthedocs.org>`_ (zEpid Package, https://pypi.org/project/zepid/).
 
     Args:
-        adata: :class:`~anndata.AnnData` object containing the summary table from the CoxPHFitter. This object is populated using the :func:`~ehrapy.tools.cox_ph` function.
-        uns_key: Key in `.uns` where the CoxPHFitter object is stored.
-        labels: List of labels for each coefficient, default uses the index of the coxph.summary.
+        adata: :class:`~anndata.AnnData` object containing the summary table from the CoxPHFitter. This is stored in the `.uns` attribute, after fitting the model using :func:`~ehrapy.tl.cox_ph`.
+        uns_key: Key in `.uns` where :func:`~ehrapy.tools.cox_ph` function stores the summary table.
+        labels: List of labels for each coefficient, default uses the index of the summary ta
         fig_size: Width, height in inches.
         t_adjuster: Adjust the table to the right.
         ecolor: Color of the error bars.