Fix fault tox docs

[Agustin Carranza]

Brief Description
-----------------
The tox-docs fails with: Invalid configuration value found: 'language = None'. Update your configuration to a valid language code. Falling back to 'en' (English).

Severity
--------
<Critical: System/Feature is not usable due to the defect>

Steps to Reproduce
------------------
Commit a change

Expected Behavior
------------------
All zuul jobs pass.

Actual Behavior
----------------
tox-docs failed.

Reproducibility
---------------
<Reproducible>

System Configuration
--------------------
<One node system, Two node system, Multi-node system, Dedicated storage, https, IPv4, IPv6 etc.>

Branch/Pull Time/Commit
-----------------------
master

Last Pass
---------
NA

Timestamp/Logs
--------------
NA

Test Activity
-------------
NA

Workaround
----------
NA

[Agustin Carranza (acarranz)]

Fix proposed to master branch:
https://review.opendev.org/c/starlingx/fault/+/893049

[Bruno Drugowick Muniz (brunomuniz)]

The tox for the docs repo is failing independently as well, so I opened this LP: https://bugs.launchpad.net/starlingx/+bug/2030817. To fix, I proposed: https://review.opendev.org/c/starlingx/docs/+/890833, which has an ongoing discussion about the right way to fix this.

Could these LPs be related?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/fault/+/893049
Committed: https://opendev.org/starlingx/fault/commit/b9cc232de3d1b91989a3c228c21d3d0a51cf2f31
Submitter: "Zuul (22348)"
Branch: master

commit b9cc232de3d1b91989a3c228c21d3d0a51cf2f31
Author: Agustin Carranza <email address hidden>
Date: Tue Aug 29 10:06:31 2023 -0300

    Fix sphinx configuration for tox docs

    With sphinx version update, it is raised a warning (treated as
    error) with the 'language = None' configuration. The default value is
    'language = en' which has the same behavior.

    Test plan
    PASS: Run tox and check it ends successfully.

    Closes-bug: 2033412
    Related-Bug: #1976377

    Change-Id: Ie003c0a02fcfc6f237ae5b3efb259de6748077ad
    Signed-off-by: Agustin Carranza <email address hidden>

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: f/antelope
Review: https://review.opendev.org/c/starlingx/fault/+/903824

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Bob Church <email address hidden>" on branch: f/antelope
Review: https://review.opendev.org/c/starlingx/fault/+/903824
Reason: This has languished. Abandoning. If @<email address hidden> wants it reinstated, can do so.