fix: document trap data in json_info.md

[chaosvolt]

Purpose of change

thanks i hate it

Fixes #3965

Describe the solution

Slapped down a section in json_info.md dedicated to documenting the various things traps are able to do. I think I got it all, all the important stuff if nothing else.

Also lists a summary of all trapfuncs available in a subsection.

Describe alternatives you've considered

Screaming.

Testing

Used my eyes. I dunno if we have a formatter for document files...

Additional context

Checklist

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[RoyalFox2140]

Nice work

[NappingOcean]

I've always been curious about traps. Thanks.