Added line to doc about events not carrying any extra data.
Added line to doc about events not carrying any extra data.

--HG--
branch : js-redesign

muescha/hutmap,muescha/hutmap,dylanfprice/hutmap,muescha/hutmap,muescha/hutmap,dylanfprice/hutmap,dylanfprice/hutmap,dylanfprice/hutmap