Comment 11 for bug 2033431

Reviewed: https://review.opendev.org/c/starlingx/tools/+/893246
Committed: https://opendev.org/starlingx/tools/commit/0f1383f4b8e4a75590db300f327a47b88c42ed57
Submitter: "Zuul (22348)"
Branch: f/antelope

commit 0f1383f4b8e4a75590db300f327a47b88c42ed57
Author: Luan Nunes Utimura <email address hidden>
Date: Wed Aug 30 09:25:39 2023 -0300

    Fix tox-docs failing sphinx

    A new version of sphinx was released May 29 2022
    which requires a language setting in config otherwise
    a warning (treated as error) causes the sphinx operation
    to fail.

    Updated the sphinx config file to correct the issue.

    The sphinx behavioural change is mentioned here:
    https://github.com/sphinx-doc/sphinx/issues/10062
    https://github.com/sphinx-doc/sphinx/issues/10474

    Partial-Bug: 1976377
    Partial-Bug: 2033431

    Change-Id: I089f9afe7e75b5ceabe3bf05d14ffd76e33ac3ab
    Signed-off-by: Luan Nunes Utimura <email address hidden>
    (cherry picked from commit 4454fad3a8261526a1bc96e9fa3ac67dc5f1e838)