Backport PR #55911 on branch 2.1.x (DOC: convert outdated example of …

…NumPy's broadcasting to literal code block) (#55912)

Backport PR #55911: DOC: convert outdated example of NumPy's broadcasting to literal code block

Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>

doc/source/whatsnew/v0.17.0.rst

@@ -726,10 +726,10 @@ be broadcast:
 
 or it can return False if broadcasting can not be done:
 
-.. ipython:: python
-   :okwarning:
+.. code-block:: ipython
 
-   np.array([1, 2, 3]) == np.array([1, 2])
+   In [11]: np.array([1, 2, 3]) == np.array([1, 2])
+   Out[11]: False
 
 Changes to boolean comparisons vs. None
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^