README: Rearrange some text, fix a variable name.
README: Rearrange some text, fix a variable name.

puppet-community/pypuppetdb,voxpupuli/pypuppetdb,jcastillocano/pypuppetdb,jcastillocano/pypuppetdb,jorik041/pypuppetdb,dforste/pypuppetdb,amwilson/pypuppetdb,vicinus/pypuppetdb