style: align the code

source/fduthesis.dtx

@@ -1444,17 +1444,17 @@ Copyright (C) 2017&ndash;2024 by Xiangdong Zeng <xdzeng96@gmail.com>.
 %
 % \begin{function}[added=2024-05-27]{style/cover-i,style/cover-ii,style/cover-iii}
 %   \begin{fdusyntax}[emph={[1]cover-i,cover-ii,cover-iii}]
-%     cover-i = (*\marg{文件}*)
-%     cover-ii = (*\marg{文件}*)
+%     cover-i   = (*\marg{文件}*)
+%     cover-ii  = (*\marg{文件}*)
 %     cover-iii = (*\marg{文件}*)
 %   \end{fdusyntax}
 %   如果您需要和此模版不一样的封面样式，可以通过这三个选项插入自定义的封一、封二和封三 PDF 文件，
 %   当 auto-make-cover = true 时会替换自动生成的封面
 % \end{function}
 %^^A! \begin{function}[added=2024-05-27]{style/cover-i,style/cover-ii,style/cover-iii}
 %^^A!   \begin{fdusyntax}[emph={[1]cover-i,cover-ii,cover-iii}]
-%^^A!     cover-i = (*\marg{file}*)
-%^^A!     cover-ii = (*\marg{file}*)
+%^^A!     cover-i   = (*\marg{file}*)
+%^^A!     cover-ii  = (*\marg{file}*)
 %^^A!     cover-iii = (*\marg{file}*)
 %^^A!   \end{fdusyntax}
 %^^A!   If you need a different cover style from this template,