scripts/documentation-file-ref-check: accept more wildcards at filenames

at MAINTAINERS, some filename paths use '?' and things like [7,9].
So, accept more wildcards, in order to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>

scripts/documentation-file-ref-check

@@ -43,7 +43,7 @@ while (<IN>) {
 	# Skip this script
 	next if ($f eq $scriptname);
 
-	if ($ln =~ m,\b(\S*)(Documentation/[A-Za-z0-9\_\.\,\~/\*+-]*),) {
+	if ($ln =~ m,\b(\S*)(Documentation/[A-Za-z0-9\_\.\,\~/\*\[\]\?+-]*),) {
 		my $prefix = $1;
 		my $ref = $2;
 		my $base = $2;