Doc: correct nitpicky mistakes in array_position/array_positions examples.
Daniel Gustafsson and Erik Rijkers, per report from nick@cleaton
Discussion:
@@ -669,14 +669,16 @@ SELECT * FROM sal_emp WHERE pay_by_quarter &amp;&amp; ARRAY[10000];
<programlisting>
SELECT array_position(ARRAY['sun','mon','tue','wed','thu','fri','sat'], 'mon');
- array_positions
------------------
+ array_position
+----------------
2
+(1 row)
SELECT array_positions(ARRAY[1, 4, 3, 1, 3, 4, 2, 1], 1);
array_positions
-----------------
{1,4,8}
+(1 row)
</programlisting>
</para>
