Add docstring to hierarchical_f_measure function

ham.py

@@ -81,7 +81,17 @@ def calculate_hierarchical_precision_recall(
 
 
 def hierarchical_f_measure(hP, hR, beta=1.0):
-    """Calculate the hierarchical F-measure."""
+    """
+    Calculate the hierarchical F-measure.
+
+    Parameters:
+    hP (float): The hierarchical precision.
+    hR (float): The hierarchical recall.
+    beta (float, optional): The beta value for F-measure calculation. Default is 1.0.
+
+    Returns:
+    float: The hierarchical F-measure.
+    """
     if hP + hR == 0:
         return 0
     return (beta**2 + 1) * hP * hR / (beta**2 * hP + hR)