Documentation: Briefly explain the download from web service

This sounds rather lame as the app hasn't been released but it is too
useful to not have it in 3.0

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Documentation: minor spelling and consistency fixes

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Documentation: minor rewrite of the Mac Driver appendix

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>