Small doc fix for xmltable

Hi,

In the devel docs for xmltable there should be a comma after XMLNAMESPACES()

Groeten, Arjen

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index ba6f8dd..1180385 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -10504,7 +10504,7 @@ SELECT xpath_exists('/my:a/text()', '<my:a
xmlns:my="http://example.com">test</m
     </indexterm>

<synopsis>
-<function>xmltable</function>(
<optional>XMLNAMESPACES(<replaceable>namespace uri</replaceable> AS
<replaceable>namespace name</replaceable><optional>,
...</optional>)</optional>
+<function>xmltable</function>(
<optional>XMLNAMESPACES(<replaceable>namespace uri</replaceable> AS
<replaceable>namespace name</replaceable><optional>,
...</optional>),</optional>
<replaceable>row_expression</replaceable> PASSING <optional>BY
REF</optional> <replaceable>document_expression</replaceable> <optional>BY
REF</optional>
COLUMNS <replaceable>name</replaceable> {
<replaceable>type</replaceable> <optional>PATH
<replaceable>column_expression</replaceable></optional> <optional>DEFAULT
<replaceable>default_expression</replaceable></optional> <optional>NOT NULL
| NULL</optional>
| FOR ORDINALITY }