Puppetlabs-dsc: please update doco for the dsc_reboot to show relationship example on refresh event to confine reboots

Basic Info
Module Version: latest
Puppet Version: NA
OS Name/Version: NA

Working with a end user to debug their code they had worked them self distraught due to multiple reboots of their development server as they had not recognised how to use relationships to trigger or constrain the dsc_reboot resource.
https://github.com/abuxton/puppetlabs-dsc/blob/master/README.md#handling-reboots-with-dsc

Desired Behavior:
update the documentation to include a link to lang_relationships page (https://puppet.com/docs/puppet/5.0/lang_relationships.html#refreshing-and-notification), and to outline the use of notify/subscribe between a resource and the dsc_reboot the documentation inlcudes a package deployment https://github.com/abuxton/puppetlabs-dsc/blob/master/README.md#installing-packages-with-dsc it would be nice to see the two resources related and it called out for the purpose of documentation.