doc: add reference to wire protocol details

Discussion: https://postgr.es/m/143A51B2-80B1-4ECD-AF67-F7061377FF63@hotmail.com

Author: Li Japin

Backpatch-through: master

diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index 3f854000f41e0eb199f986579232b25bc9538d16..af3f016f7467756dad9f5f1ebe208daed9aed5f5 100644 (file)
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -2222,8 +2222,10 @@ psql "dbname=postgres replication=database" -c "IDENTIFY_SYSTEM;"
       </para>
 
       <para>
-       WAL data is sent as a series of CopyData messages.  (This allows
-       other information to be intermixed; in particular the server can send
+       WAL data is sent as a series of CopyData messages;
+       see <xref linkend="protocol-message-types"/> and <xref
+       linkend="protocol-message-formats"/> for details.
+       (This allows other information to be intermixed; in particular the server can send
        an ErrorResponse message if it encounters a failure after beginning
        to stream.)  The payload of each CopyData message from server to the
        client contains a message of one of the following formats: