docs: maintainers_include: preserve names for files under process/

docs: maintainers_include: preserve names for files under process/

When a maintainer's profile is stored outside process, they're
already included on some other book and the name of the filesystem
may not be there. That's why the logic picks the name from the
subsystem's name.

However, files directly placed together with maintainers-handbooks.rst
(e.g. under Documentation/process/) is a different history: those
aren't placed anywhere, so we can keep using their own names,
letting Sphinx do his thing.

Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <46961bc932be804cec19f06d202c23423d4aa12a.1777295258.git.mchehab+huawei@kernel.org>