RCBC-180: point to most recent API docs

Change-Id: Id8128f8c74ada7b707d6437c979e9d72d3870f6b
Reviewed-on: http://review.couchbase.org/40674
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>