Fix up tech debt comments from @jschatz1

 - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10837#note_28757436
 - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10837#note_28757905
 - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10837#note_28757952
 - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10837#note_28758013

Conflicts:
	app/assets/javascripts/notes.js