Correcting a typo.
Adding DG chapter 3 and corrections/revision to previous DG chapters.
Re-adding chapter 3.
Fixing malformed yaml header
Updating DG nav for chapter 3
Getting ready for next release. Merge branch 'master' of github.com:puppetlabs/puppet-docs
Updating local master. Merge branch 'master' of github.com:puppetlabs/puppet-docs
FInal edits to DG chapter 3 pre-publishing.