Correct a typo of version number in the docstring of _shared_docs['interpolate'] which is the docstring for pandas.core.resample.Resampler.interpolate, pandas.DataFrame.interpolate, pandas.Series.interpolate, and pandas.Panel.interpolate. Reference can be found at pandas-dev#8000

Author: willweil

pandas/core/generic.py

@@ -6648,7 +6648,7 @@ def replace(self, to_replace=None, value=None, inplace=False, limit=None,
               (interpolate).
             * 'outside': Only fill NaNs outside valid values (extrapolate).
 
-            .. versionadded:: 0.21.0
+            .. versionadded:: 0.23.0
 
         downcast : optional, 'infer' or None, defaults to None
             Downcast dtypes if possible.