Code review comment for lp:~nhandler/ubuntu-docs/packaging-guides

This branch adds https://wiki.ubuntu.com/PackagingGuide/Complete

I am aware that it does not validate:

$ scripts/validate.sh packaging/C/packaging.xml
 --Validating packaging/C/packaging.xml ...
packaging/C/packaging.xml:953: element tgroup: validity error : Element tgroup content does not follow the DTD, expecting (colspec* , spanspec* , thead? , tfoot? , tbody), got (thead )
packaging/C/packaging.xml:962: element tgroup: validity error : Element tgroup content does not follow the DTD, expecting (colspec* , spanspec* , thead? , tfoot? , tbody), got (thead )
Document packaging/C/packaging.xml does not validate

This is do to the file having an <informaltable> with a <thead> and no <tbody>. I am still trying to find a solution to that problem.