PE 3.3: Add improved info about Windows MSI properties

This info comes from the foss install guide.
PE 3.3: point all Puppet reference manual links to correct version

PE 3.3 uses puppet 3.6.
PE 3.3: Remove http://docs.puppetlabs.com from absolute links

This isn't needed, and can potentially interfere with stuff.
PE 3.3: Update puppetdb links to current version

PE 3.3 uses PuppetDB 1.6.
PE 3.3: Fix bad relative links and weird ellipsis