Update TLS 1.3 citations for the final RFC.

Change-Id: I2d1671a4f21a602191fd0c9b932244a376ac5713
Reviewed-on: https://boringssl-review.googlesource.com/31104
Reviewed-by: David Benjamin <davidben@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/ssl/internal.h b/ssl/internal.h
index e612f6d..14c871a 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -2462,11 +2462,10 @@
   bool shed_handshake_config : 1;
 };
 
-// From draft-ietf-tls-tls13-18, used in determining PSK modes.
+// From RFC 8446, used in determining PSK modes.
 #define SSL_PSK_DHE_KE 0x1
 
-// From draft-ietf-tls-tls13-16, used in determining whether to respond with a
-// KeyUpdate.
+// From RFC 8446, used in determining whether to respond with a KeyUpdate.
 #define SSL_KEY_UPDATE_NOT_REQUESTED 0
 #define SSL_KEY_UPDATE_REQUESTED 1