doc: document the "--print-datasize" parameter to "ctdb"

(This used to be ctdb commit 9e8045a5b0d8bd9ab2e0343b329de9f45b883531)

ctdb/doc/ctdb.1.xml

@@ -31,6 +31,7 @@
 		<arg choice="opt">-d --debug=&lt;INTEGER&gt;</arg>
 		<arg choice="opt">--socket=&lt;filename&gt;</arg>
 		<arg choice="opt">--print-emptyrecords</arg>
+		<arg choice="opt">--print-datasize</arg>
 	</cmdsynopsis>
 	
 </refsynopsisdiv>
@@ -136,6 +137,15 @@
         </listitem>
       </varlistentry>
 
+      <varlistentry><term>--print-datasize</term>
+        <listitem>
+          <para>
+            This lets database dumps (catdb, cattdb, dumpdbbackup) print the
+            size of the record data instead of dumping the data contents.
+          </para>
+        </listitem>
+      </varlistentry>
+
     </variablelist>
   </refsect1>