Add help for spawn eggs and name tags

mods/ENTITIES/mobs/api.lua

@@ -2826,6 +2826,8 @@ function mobs:register_egg(mob, desc, background, addegg, no_creative)
 	minetest.register_craftitem(mob, {
 
 		description = desc,
+		_doc_items_longdesc = "So called “spawn eggs” are items which are used to spawn a single monster or animal.",
+		_doc_items_usagehelp = "Place the spawn egg on any block to make a mob appear at this position.",
 		inventory_image = invimg,
 		groups = grp,
 

mods/ENTITIES/mobs/crafts.lua

@@ -4,6 +4,8 @@ local S = mobs.intllib
 -- name tag
 minetest.register_craftitem("mobs:nametag", {
 	description = S("Name Tag"),
+	_doc_items_longdesc = S("A name tag is an item to name most animals and monsters."),
+	_doc_items_usagehelp = S("Rightclick an animal or monster while holding the name tag, then enter a name."),
 	inventory_image = "mobs_nametag.png",
 	wield_image = "mobs_nametag.png",
 	stack_max = 64,