Core API comment re defects per LoC

[jmcp]

I'm going through the online draft and noticed this comment at http://guide.couchdb.org/draft/api.html (just before Documents in Detail):

Another reason CouchDB uses MVCC is that this model is simpler conceptually and, as
a consequence, easier to program. CouchDB uses less code to make this work, and less
code is always good because the ratio of defects per lines of code is static.

I do not think that this is expressed very well.

The number of lines of code is not necessarily correlated with the number of defects, and that ratio can change over time (hopefully approaching 0). A better way to express this paragraph might go something like this:

Another reason CouchDB uses MVCC is that this model is simpler conceptually and, as
a consequence, easier to program. CouchDB uses less code to make this work, and that
means fewer opportunities for defects (or bugs) to exist.