Added all Section 6 items from Levels 1 & 2

https://benchmarks.cisecurity.org/tools2/ubuntu/CIS_Ubuntu_12.04_LTS_Server_Benchmark_v1.0.0.pdf
Seemed unnecessary.  There are no comments used in any other context within the tasks.  Saying there are no level 2 tasks seemed superfluous when having no tasks seems to indicate the same thing to me.