Update documentation

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2550)
diff --git a/doc/man1/ciphers.pod b/doc/man1/ciphers.pod
index c1d1cb2..aa8ace2 100644
--- a/doc/man1/ciphers.pod
+++ b/doc/man1/ciphers.pod
@@ -670,6 +670,14 @@
  TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256        DHE-PSK-CHACHA20-POLY1305
  TLS_RSA_PSK_WITH_CHACHA20_POLY1305_SHA256        RSA-PSK-CHACHA20-POLY1305
 
+=head2 TLS v1.3 cipher suites
+
+ TLS_AES_128_GCM_SHA256                     TLS13-AES-128-GCM-SHA256
+ TLS_AES_256_GCM_SHA384                     TLS13-AES-256-GCM-SHA384
+ TLS_CHACHA20_POLY1305_SHA256               TLS13-CHACHA20-POLY1305-SHA256
+ TLS_AES_128_CCM_SHA256                     TLS13-AES-128-CCM-SHA256
+ TLS_AES_128_CCM_8_SHA256                   TLS13-AES-128-CCM-8-SHA256
+
 =head2 Older names used by OpenSSL
 
 The following names are accepted by older releases: