better item-spawning documentation

[dynst]

Is your feature request related to a problem? Please describe.

ITEM_SPAWN.md documents the "count" field, which sounds like it means the total count of individual items, but as implemented it might actually mean the number of full stacks of items?

MAP_GEN.md documents fields like "chance" and "repeat" but they aren't in the item-spawning docs.

Solution you would like.

Document the intended interaction between "count" and a spawned item's "stack_size". If you spawn polycarbonate_sheet or nail with "count": 3, will it technically spawn 60 sheets and 300 nails?

Document "chance" and how "repeat" interacts with item fields: if an item has a container-item, does the container repeat, or do more items get added to the container?

Describe alternatives you have considered.

No response

Additional context

No response

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