update docs

Author: sycai

third_party/bigframes_vendored/pandas/core/generic.py

@@ -1072,6 +1072,16 @@ def rolling(
             4       2
             dtype: Int64
 
+            >>> df = bpd.DataFrame({'A': [0,1,2,3], 'B': [0,2,4,6]})
+            >>> df.rolling(window=2, on='A', closed='both').sum()
+            A     B
+            0  0  <NA>
+            1  1     2
+            2  2     6
+            3  3    12
+            <BLANKLINE>
+            [4 rows x 2 columns]
+
         Args:
             window (int):
                 Size of the moving window.

third_party/bigframes_vendored/pandas/core/groupby/__init__.py

@@ -1036,7 +1036,7 @@ def rolling(self, *args, **kwargs):
                 to the size of the window.
 
             on (str, optional):
-                For a DataFrame, a column label or Index level on which to calculate the rolling window,
+                For a DataFrame, a column label on which to calculate the rolling window,
                 rather than the DataFrame’s index.
 
             closed (str, default 'right'):