PGSQL examples should specify the $connection parameter (#4096)

This behaviour was deprecated, and the manual should ideally only have deprecation free code examples.

Author: mmalferov

reference/pgsql/examples.xml

@@ -13,13 +13,14 @@
     <programlisting role="php">
 <![CDATA[
 <?php
+
 // Connecting, selecting database
 $dbconn = pg_connect("host=localhost dbname=publishing user=www password=foo")
     or die('Could not connect: ' . pg_last_error());
 
 // Performing SQL query
 $query = 'SELECT * FROM authors';
-$result = pg_query($query) or die('Query failed: ' . pg_last_error());
+$result = pg_query($dbconn, $query) or die('Query failed: ' . pg_last_error());
 
 // Printing results in HTML
 echo "<table>\n";
@@ -37,6 +38,7 @@ pg_free_result($result);
 
 // Closing connection
 pg_close($dbconn);
+
 ?>
 ]]>
     </programlisting>