I think that if we want this example in there, we need to explain more
about how it works.

Minor fixes

(so that we can avoid a broken link in a wiki page we're migrating)

I was just trying this hook out in 4.7.22, the result pulls out the first element of the return and lists that on the case summary page. From the old docs, just gets the first key/val pair, then displays the first character of the label/value string.

- Conform to standards
- Fix broken links