list the different sorts of docs
Merge pull request #107 from dipohl/patch-2

list the different sorts of docs
docs: Add a section about wich sort of documentation to place in Munin's Wiki
docs: Outline sections
docs: Moved one more section from Munin-Wiki page to here (http://munin-monitoring.org/wiki/MuninNomenclature)
docs: more sections to move wiki content to here
docs: rename DocBook to Guide
docs: a further rename
docs: Rename this to "Munin Guide" as we have further documentations areas and need a less general term