tcp: fix RFC reference

Change-Id: Icfcec5122745035cd6b5cb3d53e69fcc48bbbe73
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10222
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>

src/add-ons/kernel/network/protocols/tcp/TCPEndpoint.cpp

@@ -1225,7 +1225,7 @@ TCPEndpoint::_Disconnect(bool closing)
 
 	if (fState == SYNCHRONIZE_RECEIVED || fState == ESTABLISHED) {
 		// We "should send a RST if there is any unread received data,
-		// or if any new data is received" (RFC 2525 § 2.16). This
+		// or if any new data is received" (RFC 2525 § 2.17). This
 		// isn't a TCP state, so use a flag.
 		if (closing && fReceiveQueue.Available() > 0)
 			fFlags |= FLAG_USER_CLOSED;