nit: Update references to draft-ietf-tls-subcerts.

Change-Id: Ica6ea6eaff1849c7ee42be671b22006fe3ee5ff4
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/35444
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
diff --git a/ssl/internal.h b/ssl/internal.h
index a32122e..16b2866 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -1392,7 +1392,7 @@
   static UniquePtr<DC> Parse(CRYPTO_BUFFER *in, uint8_t *out_alert);
 
   // raw is the delegated credential encoded as specified in draft-ietf-tls-
-  // subcerts-02.
+  // subcerts-03.
   UniquePtr<CRYPTO_BUFFER> raw;
 
   // expected_cert_verify_algorithm is the signature scheme of the DC public