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Mostly minor sentence construction tweaks, typos, and using words instead of digits for small numbers.
I also added a couple of mentions that you might want to use Shiny not only for inputs, but also for automatic updates using reactiveFileReader/reactivePoll.
Two more things:
renderPlot; I don't think the static plots will actually resize without this.renderPlot, there's a link I added under "Figure sizes and scaling" that needs to be updated (currently it'sshiny.html#TODO).