The openmrs guide was written during a book sprint a few weeks ago. The book needs a once-over to find any grammatical errors.
Edits can be done on the booki site: http://www.booki.cc/openmrs
(This should be done by someone with knowledge of the history: Burke, Ben, Paul, Darius, Hamish. If sizable, then comments about history can be made here and new tickets created instead of in-book editing)