Replace riak-cs CLI documentation with aws-cli instructions
Replace riak-cs CLI documentation with aws-cli instructions

[#91645514]

Signed-off-by: Chris Hendrix <f9e38fc3e1ff46784bdcadbf77d17f93932faf2c@pivotal.io>

cloudfoundry/cf-riak-cs-release,cloudfoundry/cf-riak-cs-release,cloudfoundry/cf-riak-cs-release,cloudfoundry/cf-riak-cs-release