fixed Hello Couchbase examples

(resubmitted PR to stage)

Cleaned up the smart quotes and completed the call to bucket.replace to make the Hello Couchbase example work. It now throws "Error: No such key" since the aass_brewery_juleol beer does not exist in default beer-sample data.

I am curious though, should the example be updated to work against a beer that is included in the default beer-sample data?