add the xAxis/yAxis warning directly to the docs
add the xAxis/yAxis warning directly to the docs

not that it'll help, just because whenever I see the Caution I think it
must be referring to this problem

mtraynham/dc.js,TheDataShed/dc.js,mtraynham/dc.js,aaronhoffman/dc.js,aaronhoffman/dc.js,aaronhoffman/dc.js,aaronhoffman/dc.js,TheDataShed/dc.js,TheDataShed/dc.js,dc-js/dc.js,aaronhoffman/dc.js,dc-js/dc.js,mtraynham/dc.js,mtraynham/dc.js,dc-js/dc.js,TheDataShed/dc.js,mtraynham/dc.js,TheDataShed/dc.js,dc-js/dc.js,dc-js/dc.js