sd-dhcp-client: fix RFC number

src/libsystemd-network/sd-dhcp-client.c

@@ -848,7 +848,7 @@ static int client_message_init(
         secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
         packet->dhcp.secs = htobe16(secs);
 
-        /* RFC2132 section 4.1
+        /* RFC2131 section 4.1
            A client that cannot receive unicast IP datagrams until its protocol
            software has been configured with an IP address SHOULD set the
            BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or
@@ -862,7 +862,7 @@ static int client_message_init(
         if (client->request_broadcast || client->arp_type != ARPHRD_ETHER)
                 packet->dhcp.flags = htobe16(0x8000);
 
-        /* RFC2132 section 4.1.1:
+        /* RFC2131 section 4.1.1:
            The client MUST include its hardware address in the ’chaddr’ field, if
            necessary for delivery of DHCP reply messages.  Non-Ethernet
            interfaces will leave 'chaddr' empty and use the client identifier