docs: correcting the links to the wiki

- pointing to the new wiki page on 'How to build CloudStack'. Although
  we shouldnt be using wiki sections on our docs.
- Also formatting the rpms built by cloudstack into a paramlisting
(cherry picked from commit c2afa0f03ce3c9a0f04dcc108039ba5ef2d9edf9)
CLOUDSTACK-4569 review comments on egress firewall and multiple ip per nic