DOC: Fix PR01, PR02, RT03 on cumulative function (#33000)

Author: farhanreynaldo

pandas/core/generic.py

@@ -10541,13 +10541,14 @@ def _doc_parms(cls):
 skipna : bool, default True
     Exclude NA/null values. If an entire row/column is NA, the result
     will be NA.
-*args, **kwargs :
+*args, **kwargs
     Additional keywords have no effect but might be accepted for
     compatibility with NumPy.
 
 Returns
 -------
 %(name1)s or %(name2)s
+    Return cumulative %(desc)s of %(name1)s or %(name2)s.
 
 See Also
 --------