add blank line

Author: luke

doc/source/whatsnew/v2.0.0.rst

@@ -554,8 +554,9 @@ Deprecations
 ~~~~~~~~~~~~
 - Deprecated argument ``infer_datetime_format`` in :func:`to_datetime` and :func:`read_csv`, as a strict version of it is now the default (:issue:`48621`)
 - Deprecated :func:`pandas.io.sql.execute`(:issue:`50185`)
-.. ---------------------------------------------------------------------------
+-
 
+.. ---------------------------------------------------------------------------
 .. _whatsnew_200.prior_deprecations:
 
 Removal of prior version deprecations/changes