PEP8: add one more space before 'hippo'

Author: DaanVanHauwermeiren

Diff for: pandas/core/series.py

@@ -2778,7 +2778,7 @@ def isin(self, values):
         --------
 
         >>> s = pd.Series(['lama', 'cow', 'lama', 'beetle', 'lama',
-        ...               'hippo'], name='animal')
+        ...                'hippo'], name='animal')
         >>> s.isin(['cow', 'lama'])
         0     True
         1     True