[span.syn] Fix formatting of comment in header synopsis

Author: jensmaurer

source/containers.tex

@@ -14307,7 +14307,7 @@
   // constants
   inline constexpr size_t @\libglobal{dynamic_extent}@ = numeric_limits<size_t>::max();
 
-  // \ref{views.span}, class template span
+  // \ref{views.span}, class template \tcode{span}
   template<class ElementType, size_t Extent = dynamic_extent>
     class span;