doc/basic-client.txt:  Fix "directoriess"
doc/basic-client.txt:  Fix "directoriess"

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