docs: conf: don't rely on cwd to get documentation location

Instead of relying that Sphinx will be called from Documentation/
dir, pick the location based on __file__.

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: <34c38718dfade91ff6f7afca5e9c1705ba253c97.1768838938.git.mchehab+huawei@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2026-01-19 17:23:06 +01:00 • committed by Jonathan Corbet
commit f123cffb00