code-block documentation doesn't mention `:class:` option

[simonw]

Describe the bug

The following can be used to add an extra HTML class to a code block:

.. code-block:: json
   :class: metadata-json

    {
        "databases": {}
    }

But it's not mentioned in the documentation here: https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#directive-code-block

How to Reproduce

View https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#directive-code-block

Expected behavior

No response

Your project

https://github.com/simonw/datasette

Screenshots

No response

OS

All

Python version

All

Sphinx version

All

Sphinx extensions

No response

Extra tools

No response

Additional context

No response

[simonw]

Looks like this is the file that should include this: https://github.com/sphinx-doc/sphinx/blob/master/doc/usage/restructuredtext/directives.rst#showing-code-examples

[tk0miya]

Thank you for your report. Fixed by #10464. Will be updated soon.