MAINTAINERS: update cifs location

Commit 30706a545417 ("cifs: create a new Documentation/ directory and
move docfiles into it") moved the files, update the pattern.

Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed