Bug 20663: Add some POD, so koha test tools don't complain

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

C4/Reports/Guided.pm

@@ -812,6 +812,13 @@ sub delete_definition {
 	$sth->execute($id);
 }
 
+=head2 get_sql($report_id)
+
+Given a report id, return the SQL statement for that report.
+Otherwise, it just returns.
+
+=cut
+
 sub get_sql {
 	my ($id) = @_ or return;
 	my $dbh = C4::Context->dbh();