[Doc] add -nc to 'wget' for skipping files already exist #713
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wget
命令后面添加-nc
参数,跳过已经存在的文件,防止多次执行时重复下载;curl
命令由于没有类似的功能因此不作改变。math_module
里Literal
改为兼容 python 3.7 写法