Missed --haly-on-error (see #57) [ci skip]

l3build.dtx

@@ -324,7 +324,7 @@
 % \item |--force| (|-f|) Force checks to run even if sanity
 %   checks fail, \emph{e.g.}~when |--engine| is not given in
 %   \luavar{checkengines}
-% \item \texttt{--halt-on-error} (|-H|) Specifies that checks
+% \item |--halt-on-error| (|-H|) Specifies that checks
 %   should stop as soon as possible, rather than running all requested
 %   tests; the difference file is printed in the terminal directly in the case of failure
 %  \item |--last| Name of the last test to run