Update the TLS 1.3 draft version to draft 16.

This should land in the same group of revisions as the two parent
commits.

Change-Id: Id9d769b890b3308ea70b705e7241c73cb1930ede
Reviewed-on: https://boringssl-review.googlesource.com/11581
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index c9f5bbf..3c9f5ba 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1908,7 +1908,7 @@
 
 /* Pre Shared Key
  *
- * https://tools.ietf.org/html/draft-ietf-tls-tls13-15 */
+ * https://tools.ietf.org/html/draft-ietf-tls-tls13-16#section-4.2.6 */
 
 static int ext_pre_shared_key_add_clienthello(SSL *ssl, CBB *out) {
   uint16_t min_version, max_version;
@@ -2010,7 +2010,7 @@
 
 /* Key Share
  *
- * https://tools.ietf.org/html/draft-ietf-tls-tls13-12 */
+ * https://tools.ietf.org/html/draft-ietf-tls-tls13-16#section-4.2.5 */
 
 static int ext_key_share_add_clienthello(SSL *ssl, CBB *out) {
   uint16_t min_version, max_version;
@@ -2293,7 +2293,7 @@
 /* Negotiated Groups
  *
  * https://tools.ietf.org/html/rfc4492#section-5.1.2
- * https://tools.ietf.org/html/draft-ietf-tls-tls13-12#section-6.3.2.2 */
+ * https://tools.ietf.org/html/draft-ietf-tls-tls13-16#section-4.2.4 */
 
 static int ext_supported_groups_add_clienthello(SSL *ssl, CBB *out) {
   if (!ssl_any_ec_cipher_suites_enabled(ssl)) {