add internal explanatory references, e.g. raw vs evaluated forms

[light-matters]

@holyjak said:
Perhaps the Quickstart should be even more clear on the distinction between the "quoted / unevaluated data form" like '(Power 2 3) and the "convenience function form" of (wl/Power 2 3) (and the fact that the latter is only a thin layer over the former). Then we could also refer to that section...

[holyjak]

Likely we need first #97 to have something to link to