[support.initlist] Teletype font for initializer_list

This note is talking about the class type, not the grammatical construct,
so it should say `initializer_list`.

Author: Quuxplusone

source/support.tex

@@ -4117,7 +4117,7 @@
 A pair of pointers or a pointer plus
 a length would be obvious representations for \tcode{initializer_list}.
 \tcode{initializer_list} is used to implement initializer lists as specified
-in~\ref{dcl.init.list}. Copying an initializer list does not copy the underlying
+in~\ref{dcl.init.list}. Copying an \tcode{initializer_list} does not copy the underlying
 elements.
 \end{note}