Minor grammatical changes

In "Establish Roles and Responsibilities," (1) made verbs in example responsibilities parallel; (2) in key action 3 description, changed "who" to "whom"; (3) cleaning up clauses in key action 4 description.  

Also, while I did not change it, the wording of key action 2 ("Assign responsibility to other organizational areas that impact on the provision of accessible websites") strikes me as awkward.  Can "impact on" be changed to just "impact"?
Merge pull request #2 from happywebdiva/patch-2

Minor grammatical changes