docs: MAINTAINERS: update Mauro's files/paths

Update Mauro's F: (files/paths) entry for docs scripts so that
get_maintainer.pl will report these correctly.

This is copied from Jon's entries for these paths.

Signed-off-by: Randy Dunlap <[e-mail]>
Reviewed-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Message-ID: <[e-mail]>

MAINTAINERS

···
 L:	[e-mail]
 S:	Maintained
 F:	Documentation/sphinx/
+F:	scripts/kernel-doc*
+F:	tools/lib/python/*
 F:	tools/docs/
 
 DOCUMENTATION/ITALIAN