MAINTAINERS: extend DOCUMENTATION SCRIPTS to the full directories

MAINTAINERS: extend DOCUMENTATION SCRIPTS to the full directories

Due to commit abd61d1ff8f0 ("scripts: sphinx-pre-install: move it to
tools/docs"), checkpatch.pl --self-test=patterns reported a non-matching
file entry in DOCUMENTATION SCRIPTS. Clearly, there are now multiple
documentation scripts, all located in Documentation/sphinx/ and tools/docs/
and Mauro is the maintainer of those.

Update the DOCUMENTATION SCRIPTS section to cover these directories. While
at it, also make the DOCUMENTATION section cover the subdirectories of
tools/docs/.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20251103075948.26026-1-lukas.bulwahn@redhat.com>