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>
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