DevDocs corrections part 1

Started reviewing the developer docs, finding lots of things to correct. I'll do more later, but please review this batch first so I know what, if anything, needs to be fixed moving forward - I'm not entirely sure on the markdownish format used.
This is incorrect.  If the max is 2**255 and the target is anything less than 2**255, then you should get less than 2**255 practically all the time.  I suggest restoring the original phrasing of lines 94 and 95.