dillon1000/react

Docs: do not render components to `document.body`

Rendering to `document.body` in the examples is conveniently short, but it can
be misleading at the same time, especially for newcomers.

While it's possible to render React components to `document.body`, any 3rd
party scripts can also mess up with it, and it can have unintended consequences
and be source of difficult-to-trace bugs.