LWG fixup

Co-authored-by: Johel Ernesto Guerrero Peña <[email protected]>

Author: jensmaurer

source/ranges.tex

@@ -5872,8 +5872,7 @@
     @\exposid{inner-iterator}@() = default;
     constexpr explicit @\exposid{inner-iterator}@(@\exposid{outer-iterator}@<Const> i);
 
-    constexpr iterator_t<@\exposid{Base}@> base() const&
-      requires @\libconcept{copyable}@<iterator_t<@\exposid{Base}@>>;
+    constexpr const iterator_t<@\exposid{Base}@>& base() const &;
     constexpr iterator_t<@\exposid{Base}@> base() &&;
 
     constexpr decltype(auto) operator*() const { return *@\exposid{i_}@.@\placeholder{current}@; }
@@ -5930,8 +5929,7 @@
 
 \indexlibrarymember{base}{lazy_split_view::\exposid{inner-iterator}}%
 \begin{itemdecl}
-constexpr iterator_t<@\exposid{Base}@> base() const&
-  requires @\libconcept{copyable}@<iterator_t<@\exposid{Base}@>>;
+constexpr const iterator_t<@\exposid{Base}@>& base() const &;
 \end{itemdecl}
 
 \begin{itemdescr}