Update Trigger Language section 1.4

[zsarge]

On the page "https://spu7nix.net/spwn/#/triggerlanguage/4control_flow?id=for-loop", which discusses for loops and iterators, it says:

Note: Instead of writing 0..10 you can also just write ..10

But it seems that, according to the 0.8 release notes,

Unary .. operator is no longer allowed (for example ..10 now needs to be written as 0..10)

It appears this page needs to be updated.

(I've never used spwn, so I still might be missing something)

[SpeckyYT]

PR #56 fixes this issue

[Spu7Nix]

Doesn't remove the message info box though

[SpeckyYT]

#58