Applied agreed Cognitive TF comments

Made small changes based upon input from the Cognitive Task Force.
Changed KA- to IC- in checklist to match the main document.
Merge pull request #11 from w3c/p-cog

Applied agreed Cognitive TF comments
Merge branch 'master', remote branch 'origin'
Comment 1 from Andrew Normand

Added language to clarify that we are talking about pan control
in section 2.5