Fix UfoFoldVirtTextHandler type annotations

[anuvyklack]

fix type commits have descriptions.

[kevinhwang91]

Thanks! I don't know ---@field [1] will work. Would you share the reference? Look like I need to improve my emmylua knowledge.

[anuvyklack]

It is not EmmyLua, it is just Lua itself.

The list

local list = { 'one', 'twe', 'three' }

is actually a table:

local list = {
   [1] = 'one',
   [2] = 'two',
   [3] = 'three'
}

So [1], [2] and [3] are real keys of the table, and you can specify them in an annotation.

[kevinhwang91]

Cool, not aware of the Lua table is everything.