Update l3build.dtx

Co-authored-by: Yukai Chou <[email protected]>

l3build.dtx

@@ -395,9 +395,9 @@
 %   in the full \texttt{.log} file of a failed test to be shown on the console
 % \item |--show-saves| (|-S|) When tests fail, prints the \texttt{l3build save} commands needed
 %   to regenerate the tests assuming that the failures were false negatives.
+% \item |--shuffle| Shuffles the order in which tests run
 % \item |--stdengine| (|-s|) Run tests only with the standard engine (which can vary between
 %   configurations)
-% \item |--shuffle| Shuffles the order in which tests run
 % \item |--texmfhome| Sets the location of the user tree for installing
 % \end{itemize}
 %