[exec.snd.expos] Use \dotsc and \vdots for a non-code ellipsis

Author: lprv

source/exec.tex

@@ -1491,11 +1491,11 @@
 
 \pnum
 \begin{codeblock}
-template<class T@$_0$@, class T@$_1$@, @...,@ class T@$_n$@>
+template<class T@$_0$@, class T@$_1$@, @$\dotsc$,@ class T@$_n$@>
 struct @\exposid{product-type}@ {       // \expos
   T@$_0$@ t@$_0$@;                // \expos
   T@$_1$@ t@$_1$@;                // \expos
-    @...@
+    @\vdots@
   T@$_n$@ t@$_n$@;                // \expos
 
   template<size_t I, class Self>