DOC: adding e to get_indexer_for (pandas-dev#35498)

Author: alexhlim

pandas/core/indexes/base.py

@@ -4690,6 +4690,12 @@ def get_indexer_for(self, target, **kwargs):
         -------
         numpy.ndarray
             List of indices.
+
+        Examples
+        --------
+        >>> idx = pd.Index([np.nan, 'var1', np.nan])
+        >>> idx.get_indexer_for([np.nan])
+        array([0, 2])
         """
         if self.is_unique:
             return self.get_indexer(target, **kwargs)