fix doc 2

mods/ITEMS/mcl_cauldrons/API.md

@@ -5,6 +5,14 @@ This mod add an API to add cauldrons to mcl.
 ## mcl_cauldrons.is_cauldron(name)
 return true if name is cauldron, false overwise.
 
+## mcl_cauldrons.take_cauldron(pos, itemstack, user, sounds)
+empty cauldron at `pos`
+return `bucket` field of the cauldron def if user is player, itemstack overwise.
+* pos: position of the cauldron
+* itemstack: will be return if `bucket` field isn't defined in cauldron def or user is nil or not player.
+* user: player who takes cauldron
+* sounds: sounds table. If not nil, dug sound will be played.
+
 ## mcl_cauldrons.register_cauldron_type(def)
 def can have these fields:
 * name: name of the liquid e.g: "water"