Fixup: missing indent

Author: jensmaurer

source/ranges.tex

@@ -1454,8 +1454,8 @@
 namespace std {
   struct dangling {
     constexpr dangling() noexcept = default;
-  template<class... Args>
-    constexpr dangling(Args&&...) noexcept { }
+    template<class... Args>
+      constexpr dangling(Args&&...) noexcept { }
   };
 }
 \end{codeblock}