docs/parse-support.md: Add some newlines to the table output

This makes the result easier for humans to read.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Release-acked-by: Juergen Gross <jgross@suse.com>

docs/parse-support-md

@@ -399,7 +399,7 @@ sub write_output_row ($) {
         }
 
         $st //= '-';
-        o("<td$colspan>");
+        o("\n<td$colspan>");
         my $end_a = '';
         if ($sectnode->{Key} eq 'release-support--xen-version') {
             o(sprintf '<a href="%s">', $version_urls[$i]);