[temp.constr.normal] Use \cdots to produce an ellipsis

Author: lprv

source/templates.tex

@@ -1910,9 +1910,9 @@
 the normal forms of \tcode{E1} and \tcode{E2}.
 
 \item
-The normal form of a concept-id \tcode{C<A$_1$, A$_2$, ..., A$_n$>}
+The normal form of a concept-id \tcode{C<A$_1$, A$_2$, $\cdots$, A$_n$>}
 is the normal form of the \grammarterm{constraint-expression} of \tcode{C},
-after substituting \tcode{A$_1$, A$_2$, ..., A$_n$} for
+after substituting \tcode{A$_1$, A$_2$, $\cdots$, A$_n$} for
 \tcode{C}{'s} respective template parameters in the
 parameter mappings in each atomic constraint.
 If any such substitution results in an invalid type or expression,