draft-ietf-tls-keylogfile is now RFC 9850

We have one mismatch that I can see, but I've filed crbug.com/535328567
for that.

Change-Id: I1a5d1f2d2331ed1f7ec7dea475cc4467c3d80697
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/98867
Reviewed-by: Adam Langley <agl@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

include/openssl/ssl.h

diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index 64806d2..d9eca9b 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -5135,8 +5135,7 @@
 // should log `line` followed by a newline, synchronizing with any concurrent
 // access to the log.
 //
-// The format is described in
-// https://www.ietf.org/archive/id/draft-ietf-tls-keylogfile-01.html
+// The format is described in RFC 9850.
 //
 // WARNING: The data in `line` allows an attacker to break security properties
 // of the TLS protocol, including confidentiality, integrity, and forward