Add padding to table.simplelist for more readable output

Add padding to table.simplelist for more readable output

This adds changes to the "simplelist" structure found in the
documentation to make it more readable.

Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Suggested-by: Karl Pinc <kop@karlpinc.com>
Reviewed-by: Jonathan Katz <jonathan.katz@excoventures.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>