Macro: add missing document for ArrayLiteral#push and #unshift

[makenowjust]

Why are these methods hiding?

[bcardiff]

Because they are added in a far different place probably.

I hope they are removed actually thank to annotation. But for know it's better to have them in docs.

Thanks!

[bcardiff]

@Sija My motivations for such statement is that it makes harder to have a more incremental compilation eventually, because for understanding a macro evaluation you need to repeat the whole history since there is global state that could have change. We are far still, but the idea is lurking around.

[Sija]

@bcardiff I see, thanks for clearing up my confusion. I'd love incremental compilation, yet its implementation lefts a lot to discuss.