DOC: fix see also links in pandas.DataFrame.agg docstring (#55162)

Author: aimlnerd

pandas/core/frame.py

@@ -9829,11 +9829,11 @@ def _gotitem(
     --------
     DataFrame.apply : Perform any type of operations.
     DataFrame.transform : Perform transformation type operations.
-    pandas.core.groupby.GroupBy : Perform operations over groups.
-    pandas.core.resample.Resampler : Perform operations over resampled bins.
-    pandas.core.window.Rolling : Perform operations over rolling window.
-    pandas.core.window.Expanding : Perform operations over expanding window.
-    pandas.core.window.ExponentialMovingWindow : Perform operation over exponential
+    pandas.DataFrame.groupby : Perform operations over groups.
+    pandas.DataFrame.resample : Perform operations over resampled bins.
+    pandas.DataFrame.rolling : Perform operations over rolling window.
+    pandas.DataFrame.expanding : Perform operations over expanding window.
+    pandas.core.window.ewm.ExponentialMovingWindow : Perform operation over exponential
         weighted window.
     """
     )