fixup: user soft-hyphens to deal with overfull hbox

Co-authored-by: Jan Schultke <[email protected]>

Author: dietmarkuehl

source/exec.tex

@@ -6046,8 +6046,8 @@
 if that qualified-id is valid and denotes a type,
 \tcode{inplace_stop_source} otherwise.
 \item \tcode{error_types} is \tcode{Environment::error_types} if
-that qualified-id is valid and denotes a type, \linebreak % avoid Overfull
-\tcode{completion_signatures<set_error_t(exception_ptr)>} otherwise.
+that qualified-id is valid and denotes a type,
+\tcode{com\-pletion_sign\-atures<set_error_t(exception_ptr)>} otherwise.
 \end{itemize}
 
 \pnum