doc: add reference to wire protocol details

bmomjian · bmomjian · commit 783e816666c7 · 2023-11-01T13:57:29.000-04:00
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
@@ -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:
