Fix link in javadoc

Change-Id: I1c4574dac2e02c47cc84271822277552160c9c00
Reviewed-on: http://review.couchbase.org/41904
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>