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.
Parenthesis need to be removed from this line.  For searchers, I think it would also be nice if this sentence was followed by something like: "(Stale blocks are also sometimes called orphans, but that term is also used for blocks without a known parent block.)"