raspberrypi2.coffee: Updating links to getting started guide
raspberrypi2.coffee: Updating links to getting started guide

Signed-off-by: Gareth Davies <2f9181a725196cd0a5e07c6a6e161d83fcc71157@balena.io>

resin-os/resin-raspberrypi,resin-os/resin-raspberrypi