refactor: 将默认路径从/rc更改为/leonos

统一修改代码中的默认路径，从/rc变更为/leonos，以反映系统名称变更

data/computercraft/lua/rom/apis/help.lua

@@ -6,7 +6,7 @@ local expect = require("cc.expect").expect
 local completion = require("cc.completion")
 
 local help = {}
-help._DEFAULT_PATH = "/rc/help"
+help._DEFAULT_PATH = "/leonos/help"
 
 function help.init()
   local vars = thread.vars()