docs: conf.py: don't use doctree with a different meaning

At Sphinx, doctree is a directory where doc build cache is stored.
Use a better name.

No functional changes.

Suggested-by: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <bab090bb4b95c735bd570c9c23c6e97851b2bf7b.1768838938.git.mchehab+huawei@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2026-01-19 17:23:05 +01:00 • committed by Jonathan Corbet
commit d0b31c30b5