Added See Also sections

Author: thedataninja1786

pandas/core/groupby/generic.py

@@ -2452,6 +2452,10 @@ def nunique(self, dropna: bool = True) -> DataFrame:
         -------
         nunique: DataFrame
             Counts of unique elements in each position.
+        
+        See Also
+        --------
+        DataFrame.nunique : Count number of distinct elements in specified axis.
 
         Examples
         --------

pandas/core/groupby/groupby.py

@@ -2657,6 +2657,11 @@ def sem(self, ddof: int = 1, numeric_only: bool = False) -> NDFrameT:
         -------
         Series or DataFrame
             Standard error of the mean of values within each group.
+        
+        See Also
+        --------
+        DataFrame.groupby : Apply a function groupby to each row or column of a
+            DataFrame.
 
         Examples
         --------