Correct a typo of version number for interpolate() (pandas-dev#25418)

Author: willweil

doc/source/user_guide/missing_data.rst

@@ -335,7 +335,7 @@ examined :ref:`in the API <api.dataframe.missing>`.
 Interpolation
 ~~~~~~~~~~~~~
 
-.. versionadded:: 0.21.0
+.. versionadded:: 0.23.0
 
   The ``limit_area`` keyword argument was added.
 

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.