Add help for bow and arrow

mods/ITEMS/mcl_throwing/arrow.lua

@@ -1,5 +1,6 @@
 minetest.register_craftitem("mcl_throwing:arrow", {
 	description = "Arrow",
+	_doc_items_longdescs = "Arrows are ammunition for bows and dispensers.",
 	inventory_image = "mcl_throwing_arrow_inv.png",
 	groups = { ammo=1, ammo_bow=1 },
 })

mods/ITEMS/mcl_throwing/init.lua

@@ -94,6 +94,9 @@ end
 
 minetest.register_tool("mcl_throwing:bow", {
 	description = "Bow",
+	_doc_items_longdesc = "Bows are ranged weapons to shoot arrows at your foes.",
+	_doc_items_usagehelp = [[To use the bow, you first need to have at least one arrow anywhere in your inventory. Rightclick one to three times to charge the bow. Leftclick to shoot.
+The higher the charge, the faster the arrow will go and the higher the damage. A successful hit deals 1-5 HP of damage."]],
 	inventory_image = "mcl_throwing_bow.png",
 	stack_max = 1,
 	on_place = powerup_function("mcl_throwing:bow_0"),