[exec.util.cmplsig.trans] add missing \exposid

Author: timsong-cpp

source/exec.tex

@@ -4874,11 +4874,11 @@
 This subclause makes use of the following exposition-only entities:
 \begin{codeblock}
 template<class... As>
-  using default-set-value =
+  using @\exposid{default-set-value}@ =
     completion_signatures<set_value_t(As...)>;
 
 template<class Err>
-  using default-set-error =
+  using @\exposid{default-set-error}@ =
     completion_signatures<set_error_t(Err)>;
 \end{codeblock}