scripts: test_doc_build.py: improve dependency list
Change the dependency list to ensure that:
- all docutils versions are covered;
- provide an explanation about the dependencies;
- set a better minimal requirement for 3.4.3.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/433aeefb4ac9edbd62494334ac07bc1307387d40.1750571906.git.mchehab+huawei@kernel.org
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