Fix some Lua warnings

mods/ITEMS/REDSTONE/mesecons_wires/init.lua

@@ -90,6 +90,7 @@ local update_on_place_dig = function (pos, node)
 	end
 
 	-- Update nodes around it
+	local rules
 	if minetest.registered_nodes[node.name]
 	and minetest.registered_nodes[node.name].mesecon_wire then
 		rules = wire_rules

mods/ITEMS/mcl_core/nodes_base.lua

@@ -959,7 +959,7 @@ for i=1,8 do
 		description = desc,
 		_doc_items_longdesc = longdesc,
 		_doc_items_usagehelp = usagehelp,
-		_doc_items_create_entry = hhelp,
+		_doc_items_create_entry = help,
 		_doc_items_hidden = false,
 		tiles = {"default_snow.png"},
 		wield_image = "default_snow.png",