improved documentation for #2308
improved documentation for #2308

aws/aws-sdk-js,chrisradek/aws-sdk-js,aws/aws-sdk-js,GlideMe/aws-sdk-js,GlideMe/aws-sdk-js,aws/aws-sdk-js,chrisradek/aws-sdk-js,GlideMe/aws-sdk-js,aws/aws-sdk-js,chrisradek/aws-sdk-js,chrisradek/aws-sdk-js,GlideMe/aws-sdk-js