[iterators] Blank line between the private and public members

Author: blackteahamburger

source/iterators.tex

@@ -5280,6 +5280,7 @@
         constexpr move_sentinel& operator=(const move_sentinel<S2>& s);
 
     constexpr S base() const;
+
   private:
     S last;     // \expos
   };