DOC: remove extra space in whatsnew

Author: Scorpil

doc/source/whatsnew/v0.22.0.txt

@@ -29,7 +29,7 @@ Other Enhancements
 - :class:`pandas.io.formats.style.Styler` now has method ``hide_columns()`` to determine whether columns will be hidden in output (:issue:`14194`)
 - Improved wording of ``ValueError`` raised in :func:`to_datetime` when ``unit=`` is passed with a non-convertible value (:issue:`14350`)
 - :func:`Series.fillna` now accepts a Series or a dict as a ``value`` for a categorical dtype (:issue:`17033`)
-- :func:`get_dummies` now supports ``dtype`` argument, see :ref:`here <whatsnew_0220.enhancements.get_dummies_dtype>` for more  (:issue: `18330`)
+- :func:`get_dummies` now supports ``dtype`` argument, see :ref:`here <whatsnew_0220.enhancements.get_dummies_dtype>` for more (:issue:`18330`)
 
 .. _whatsnew_0220.enhancements.get_dummies_dtype