`code-block` in a `admonition` is nor renderd properly
Code to reproduce it:
.. Note:: Never use ``l``, ``O``, or ``I`` single letter names as these can be mistaken for ``1`` and ``0``,
depending on typeface:
.. code-block:: python
:caption: Python
O = 2 # This may look like you're trying to reassign 2 to zero