Update ranges.tex

Author: cpplearner

Diff for: source/ranges.tex

@@ -2271,7 +2271,7 @@
 Let \exposid{container-append} be defined as follows:
 \begin{codeblock}
 template<class Ref, class Container>
-constexpr auto @\exposid{container-append}@(Container& c) {                // \expos
+constexpr auto @\exposid{container-append}@(Container& c) {                    // \expos
   return [&c]<class Ref>(Ref&& ref) {
     if constexpr (requires { c.emplace_back(declval<Ref>()); })
       c.emplace_back(std::forward<Ref>(ref));