package/busybox/udhcpc.script: fix domain search comment

The domain search option is from RFC3397, not RFC3359 (which is about TLV
codepoints), so fix that.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 67a52f6fc9fe9fbe3b6ab3399ff1b55c2b4ed47c)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/busybox/udhcpc.script

@@ -56,7 +56,7 @@ case "$1" in
 		cat $TMPFILE > $RESOLV_CONF
 		rm -f $TMPFILE
 
-		# prefer rfc3359 domain search list (option 119) if available
+		# prefer rfc3397 domain search list (option 119) if available
 		if [ -n "$search" ]; then
 			search_list=$search
 		elif [ -n "$domain" ]; then