Fix a schema comment to reflect the proper accepted value.
Fix a schema comment to reflect the proper accepted value.

- The accepted value should be `off` rather than `false`.

authbox-lib/riak,elkingtonmcb/riak,glickbot/riak,GabrielNicolasAvellaneda/riak,basho/riak,amyvmiwei/riak,laurenrother/riak,DavidAlphaFox/riak,yangchengjian/riak,biddyweb/riak