MAINTAINERS: add types to akpm/mm git trees entries

MAINTAINERS: add types to akpm/mm git trees entries

Patch series "mm: trivial fixups".

This patchset is for trivial fixups of mm stuff on MAINTAINERS, tools/
selftests, and docs.

This patch (of 5):

Each SCM tree entry of MAINTAINERS file should have both type and
location, but akpm/mm git tree entries of 'MEMORY MANAGEMENT' and
'VMALLOC' sections of the file don't have the type.  Add the type.

Link: https://lkml.kernel.org/r/20230103180754.129637-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>