doc: Add link to table

Formal tables should generally have an xref in the text that points to
them.  Add them here.

diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index 65bbfc34f50b5a83deb773e48570cded9072078a..c4d3853cbf2c2ddee4348e6066c5ca0ffb48e03b 100644 (file)
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -220,7 +220,12 @@
     was not supported by the server.
    </para>
 
-   <table>
+   <para>
+    <xref linkend="protocol-versions-table"/> shows the currently supported
+    protocol versions.
+   </para>
+
+   <table id="protocol-versions-table">
     <title>Protocol versions</title>
 
     <tgroup cols="3">