Fix stats examples in README
Fix stats examples in README

Change-Id: I1ce91531476ebcc3b6bff226ed40748e54631c2b
Reviewed-on: http://review.couchbase.org/25871
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Reviewed-by: Volker Mische <fb414f8ac0dbbf87663550ae4ef5fc95b1041941@gmail.com>

dewolfe/couchbase-ruby-client,dewolfe/couchbase-ruby-client