Please help me,How to find some fixed arguments received by some APIs？

[Breathe]

function FormulaInit()

    local formula = {}                                                                                  -- 配方

    if Created_Krampus == '1' then

        formula = { Ingredient("pigskin", 4), Ingredient("waxpaper", 2), Ingredient("silk", 8) }        -- 材料:猪皮4、蜡纸2、蜘蛛丝8

    elseif Created_Krampus == '2' then

        formula = { Ingredient("pigskin", 8), Ingredient("waxpaper", 4), Ingredient("bearger_fur", 1) } -- 材料:猪皮4、蜡纸2、熊皮1

    end

    AddRecipe2("krampus_sack", formula, TECH.SCIENCE_TWO, nil, { "WEAPONS" })

end

I can only find api AddRecipe,I can't even find AddRecipe2 docs. 
The developer documentation is not very friendly or I am not used to it, so please tell me how to find the documentation I want to check.

For example, I want to add one-button items to the building,but I only know "WEAPONS".

How can I know other nouns ?