[ranges] Remove \expos markers for nested types (#4829)

An \expos marker should appear only on the first
declaration of a name.

Author: jensmaurer

source/ranges.tex

@@ -3016,7 +3016,7 @@
   template<@\libconcept{movable}@ Val, class CharT, class Traits>
     requires @\libconcept{default_initializable}@<Val> &&
              @\exposconcept{stream-extractable}@<Val, CharT, Traits>
-  class basic_istream_view<Val, CharT, Traits>::@\exposid{iterator}@ {      // \expos
+  class basic_istream_view<Val, CharT, Traits>::@\exposid{iterator}@ {
   public:
     using iterator_concept = input_iterator_tag;
     using difference_type = ptrdiff_t;
@@ -4969,7 +4969,7 @@
     requires @\libconcept{input_range}@<V> && is_object_v<Pred> &&
              @\libconcept{indirect_unary_predicate}@<const Pred, iterator_t<V>>
   template<bool Const>
-  class take_while_view<V, Pred>::@\exposidnc{sentinel}@ {            // \expos
+  class take_while_view<V, Pred>::@\exposidnc{sentinel}@ {
     using @\exposidnc{Base}@ = @\exposidnc{maybe-const}@<Const, V>;                 // \expos
 
     sentinel_t<@\exposidnc{Base}@> @\exposid{end_}@ = sentinel_t<@\exposidnc{Base}@>();         // \expos
@@ -7124,7 +7124,7 @@
              @\exposconcept{has-tuple-element}@<remove_reference_t<range_reference_t<V>>, N> &&
              @\exposconcept{returnable-element}@<range_reference_t<V>, N>
   template<bool Const>
-  class elements_view<V, N>::@\exposid{iterator}@ {                 // \expos
+  class elements_view<V, N>::@\exposid{iterator}@ {
     using @\exposid{Base}@ = @\exposid{maybe-const}@<Const, V>;                 // \expos
 
     iterator_t<@\exposid{Base}@> @\exposid{current_}@ = iterator_t<@\exposid{Base}@>();     // \expos
@@ -7523,7 +7523,7 @@
              @\placeholder{has-tuple-element}@<remove_reference_t<range_reference_t<V>>, N> &&
              @\exposconcept{returnable-element}@<range_reference_t<V>, N>
   template<bool Const>
-  class elements_view<V, N>::@\exposid{sentinel}@ {                 // \expos
+  class elements_view<V, N>::@\exposid{sentinel}@ {
   private:
     using @\exposid{Base}@ = @\exposid{maybe-const}@<Const, V>;                 // \expos
     sentinel_t<@\exposid{Base}@> @\exposid{end_}@ = sentinel_t<@\exposid{Base}@>();         // \expos