DOC: fix wording in whatsnew for get_dummies dtype argument

Author: Scorpil

doc/source/whatsnew/v0.22.0.txt

@@ -27,26 +27,16 @@ Other Enhancements
 - :class:`pandas.io.formats.style.Styler` now has method ``hide_index()`` to determine whether the index will be rendered in ouptut (:issue:`14194`)
 - :class:`pandas.io.formats.style.Styler` now has method ``hide_columns()`` to determine whether columns will be hidden in output (:issue:`14194`)
 
-``get_dummies`` now supports ``dtype`` argument
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+``get_dummies`` now supports ``dtype`` argument (:issue:`18330`)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-:func:`get_dummies` function now accepts ``dtype`` argument, which forces specific dtype for new columns. When ``dtype`` is not specified or equals to ``None``, new columns will have dtype ``uint8`` (as before), so this change is backwards compatible. (:issue:`18330`)
-
-**Previous behavior**:
-
-.. ipython:: python
-
-   df = pd.DataFrame({'a': [1, 2], 'b': [3, 4], 'c': [5, 6]})
-   pd.get_dummies(df, columns=['c'])
-
-**New behavior**:
+The :func:`get_dummies` now accepts a ``dtype`` argument, which specifies a specific dtype for the new columns. When ``dtype`` is not specified or ``None``, the dtype will be ``uint8`` as before. (:issue:`18330`)
 
 .. ipython:: python
 
    df = pd.DataFrame({'a': [1, 2], 'b': [3, 4], 'c': [5, 6]})
-   pd.get_dummies(df, columns=['c'])
-   pd.get_dummies(df, columns=['c'], dtype=bool)
-   pd.get_dummies(df, columns=['c'], dtype=np.float64)
+   pd.get_dummies(df, columns=['c']).dtypes
+   pd.get_dummies(df, columns=['c'], dtype=bool).dtypes
 
 .. _whatsnew_0220.api_breaking: