[thread.sharedmutex.requirements] system_error in code font

Author: Stefanus Du Toit

source/threads.tex

@@ -1370,7 +1370,7 @@
 \sync Prior \tcode{unlock()} operations on the same object shall synchronize with ~(\ref{intro.multithread}) this operation.
 
 \pnum
-\throws system_error when an exception is required ~(\ref{thread.req.exception}).
+\throws \tcode{system_error} when an exception is required ~(\ref{thread.req.exception}).
 
 \pnum
 \errors