I agree that the yeast will be fine with just sprinkling, and if the
instructions really did say to use "hot" water instead of warm (most
give an exact temp range somewhere around 100F) then you are probably a
lot better off that you sprinkled.

Also, since it came up in several posts, making a yeast starter and
rehydrating yeast are not the same thing. From what I've read it is not
necessary and may actually be counterproductive to make a starter with
dry yeast. I realize some people do it just to make sure the yeast is
active, but I don't think any dry yeast manufacturer recommends this
practice.