Insert line breaks in two places in SQL functions documentation.

This avoids a formatting problem in the PDF output.  In the HTML output this
isn't necessary, but we've done similar things elsewhere in the documentation
so I think it's OK to do it here, too.  I've refrained from breaking a longish
error message which also causes problems for the PDF output, because that would
make the HTML output look wrong.

Erik Rijkers

doc/src/sgml/xfunc.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.147 2010/05/16 03:55:41 rhaas Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.148 2010/05/16 04:35:04 rhaas Exp $ -->
 
  <sect1 id="xfunc">
   <title>User-Defined Functions</title>
@@ -859,7 +859,8 @@ SELECT * FROM getfoo(1) AS t1;
      output parameters, like this:
 
 <programlisting>
-CREATE FUNCTION sum_n_product_with_tab (x int, OUT sum int, OUT product int) RETURNS SETOF record AS $$
+CREATE FUNCTION sum_n_product_with_tab (x int, OUT sum int, OUT product int)
+RETURNS SETOF record AS $$
     SELECT $1 + tab.y, $1 * tab.y FROM tab;
 $$ LANGUAGE SQL;
 </programlisting>
@@ -957,7 +958,8 @@ SELECT name, listchildren(name) FROM nodes;
      done this way:
 
 <programlisting>
-CREATE FUNCTION sum_n_product_with_tab (x int) RETURNS TABLE(sum int, product int) AS $$
+CREATE FUNCTION sum_n_product_with_tab (x int)
+RETURNS TABLE(sum int, product int) AS $$
     SELECT $1 + tab.y, $1 * tab.y FROM tab;
 $$ LANGUAGE SQL;
 </programlisting>