Add hint to help find the relevant part of the Node docs

When I approached this problem I was pretty confused about what was being asked for or perhaps more specifically how to get the string provided (`0 15 24 3 250 83`) into a buffer.  Enter it as a string? Enter with string & use encoding hex?  Use an array? Enter as an array with encoding hex?

I searched the linked docs page for "byte" but that didn't help much- the [constructor that took an Array](http://nodejs.org/api/all.html#all_new_buffer_array) did not mention "bytes."  Thru trial and error I figured out that 1. the string should be entered as an array 2. conversion to hex isn't worried about until output & 3. **bytes & octets are interchangeable in that part of the docs.**  I think adding a hint for point 3 is justifiable.