minor clarifications
minor clarifications

* move definition of user type
* add definition of facility
* tweak title
* add clarification for URL
* add justification for needing a new super user
learningequality/kolibri,benjaoming/kolibri,indirectlylit/kolibri,mrpau/kolibri,rtibbles/kolibri,rtibbles/kolibri,indirectlylit/kolibri,DXCanas/kolibri,lyw07/kolibri,learningequality/kolibri,benjaoming/kolibri,rtibbles/kolibri,rtibbles/kolibri,christianmemije/kolibri,DXCanas/kolibri,DXCanas/kolibri,jonboiser/kolibri,lyw07/kolibri,indirectlylit/kolibri,lyw07/kolibri,learningequality/kolibri,mrpau/kolibri,jonboiser/kolibri,christianmemije/kolibri,MingDai/kolibri,mrpau/kolibri,jonboiser/kolibri,mrpau/kolibri,MingDai/kolibri,benjaoming/kolibri,jonboiser/kolibri,MingDai/kolibri,learningequality/kolibri,MingDai/kolibri,benjaoming/kolibri,indirectlylit/kolibri,christianmemije/kolibri,lyw07/kolibri,DXCanas/kolibri,christianmemije/kolibri