Reorganized and clarrified the Holland backup-set config docs.

Re-arranged a few paragraphs to flow better, reworded things that
didn't make as much sense, provided better examples of the hooks.
Fixed a mispelling
Added clarity for pugre commands, hooks.
Added a bit more warning about after-backup-command behavior
Merge pull request #113 from m00dawg/master

Reorganized and clarrified the Holland backup-set config docs.