[range.concat.iterator] Fix whitespace in constraints for operator== (#6935)

Author: hewillk

source/ranges.tex

@@ -8778,7 +8778,7 @@
       requires @\exposconcept{concat-is-random-access}@<Const, Views...>;
 
     friend constexpr bool operator==(const @\exposid{iterator}@& x, const @\exposid{iterator}@& y)
-      requires(@\libconcept{equality_comparable}@<iterator_t<@\exposid{maybe-const}@<Const, Views>>>&&...);
+      requires (@\libconcept{equality_comparable}@<iterator_t<@\exposid{maybe-const}@<Const, Views>>> && ...);
     friend constexpr bool operator==(const @\exposid{iterator}@& it, default_sentinel_t);
     friend constexpr bool operator<(const @\exposid{iterator}@& x, const @\exposid{iterator}@& y)
       requires @\exposconcept{all-random-access}@<Const, Views...>;
@@ -9164,7 +9164,7 @@
 \indexlibrarymember{operator==}{concat_view::\exposid{iterator}}%
 \begin{itemdecl}
 friend constexpr bool operator==(const @\exposid{iterator}@& x, const @\exposid{iterator}@& y)
-  requires(@\libconcept{equality_comparable}@<iterator_t<@\exposid{maybe-const}@<Const, Views>>>&&...);
+  requires (@\libconcept{equality_comparable}@<iterator_t<@\exposid{maybe-const}@<Const, Views>>> && ...);
 \end{itemdecl}
 
 \begin{itemdescr}