moving edits to pivot_table

Author: Mehgarg

pandas/core/frame.py

@@ -8564,7 +8564,8 @@ def pivot(self, index=None, columns=None, values=None) -> DataFrame:
         margins : bool, default False
             Add all row / columns (e.g. for subtotal / grand totals).
         dropna : bool, default True
-            Do not include columns whose entries are all NaN.
+            Do not include columns whose entries are all NaN. If true: 
+            exclude rows containing missing data from aggregated margins
         margins_name : str, default 'All'
             Name of the row / column that will contain the totals
             when margins is True.