Update v0.25.0.rst

TomAugspurger · web-flow · commit 58b848ad34ce · 2019-09-13T18:44:06.000-05:00
diff --git a/doc/source/whatsnew/v0.25.0.rst b/doc/source/whatsnew/v0.25.0.rst
@@ -903,7 +903,6 @@ by a ``Series`` or ``DataFrame`` with sparse values.
 **Previous way**
 
 .. code-block:: python
-   :okwarning:
 
    df = pd.SparseDataFrame({"A": [0, 0, 1, 2]})
    df.dtypes
