Fix docstring typo

Author: h-vetinari

pandas/core/frame.py

@@ -4383,7 +4383,7 @@ def duplicated(self, subset=None, keep='first', return_inverse=False):
 
         >>> data = {'species': ['lama', 'cow', 'lama', 'ant', 'lama', 'bee'],
                     'type': ['mammal'] * 3 + ['insect', 'mammal', 'insect']}
-        >>> animals = pd.DataFrame(data, index=[1, 4, 9, 16, 25])
+        >>> animals = pd.DataFrame(data, index=[1, 4, 9, 16, 25, 36])
         >>> animals
            species    type
         1     lama  mammal