[range.take.view] Replace 'struct' with 'class' for consistency

Author: jensmaurer

source/ranges.tex

@@ -4997,7 +4997,7 @@
     range_difference_t<V> @\exposid{count_}@ = 0;                   // \expos
 
     // \ref{range.take.sentinel}, class template \tcode{take_view::\exposid{sentinel}}
-    template<bool> struct @\exposid{sentinel}@;                     // \expos
+    template<bool> class @\exposid{sentinel}@;                      // \expos
 
   public:
     take_view() requires @\libconcept{default_initializable}@<V> = default;