Fixes/Input from 8091 on Dev Guide

Need to fix:
1)
http://www.couchbase.com/docs/couchbase-devguide-2.0/filter-extract-data.html

2)

On http://www.couchbase.com/docs/couchbase-devguide-2.0/documented-oriented-data-model.html

Using the brewer name as the foreign key (to use a relationship term) is probably a bad example. Changing the "Amtel" to "Amtel, Inc" in the brewer document breaks the relationship. Why not use the _id of the Brewer document?

-------------------------------Fixed---------

3) http://www.couchbase.com/docs/couchbase-devguide-2.0/get-and-lock.html

we need an example of how to use the cas operation/explicitly releasing the lock.