doc: Add missing logical replication protocol message

Author: Masahiko Sawada <sawada.mshk@gmail.com>

doc/src/sgml/protocol.sgml

@@ -6186,7 +6186,7 @@ Relation
 </term>
 <listitem>
 <para>
-                OID of the column's data type.
+                ID of the column's data type.
 </para>
 </listitem>
 </varlistentry>
@@ -6206,6 +6206,60 @@ Relation
 </listitem>
 </varlistentry>
 
+<varlistentry>
+<term>
+Type
+</term>
+<listitem>
+<para>
+
+<variablelist>
+<varlistentry>
+<term>
+        Byte1('Y')
+</term>
+<listitem>
+<para>
+                Identifies the message as a type message.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>
+        Int32
+</term>
+<listitem>
+<para>
+                ID of the data type.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>
+        String
+</term>
+<listitem>
+<para>
+                Namespace (empty string for <literal>pg_catalog</literal>).
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>
+        String
+</term>
+<listitem>
+<para>
+                Name of the data type.
+</para>
+</listitem>
+</varlistentry>
+
+</variablelist>
+</para>
+</listitem>
+</varlistentry>
+
 <varlistentry>
 <term>
 Insert