Fix some typos and blatant omission from me; new entry

Temporarily not including the script field for Jekyll for the reasons we mentioned (also removed it from the original entry because, consistency). If we really have to put them back and create isolated scripts then I can do it in one shot before the final merge into master.

Once again, as you can see, the Q&A format really feels awkward here. The error JSX outputs is very vague and varies across different situations (e.g. the msg isn't the same if you return two empty nodes vs. returning two nodes with children themselves).