Apply suggestions from code review

Co-authored-by: Hewill Kang <[email protected]>

Author: tkoeppe

source/ranges.tex

@@ -9497,7 +9497,7 @@
 \begin{example}
 \begin{codeblock}
 vector<int> vec{ 1, 2, 3 };
-for (auto [index, value] : enumerate(vec) )
+for (auto [index, value] : views::enumerate(vec))
   cout << index << ":" << value << ' ';         // prints \tcode{0:1 1:2 2:3}
 \end{codeblock}
 \end{example}
@@ -9641,7 +9641,7 @@
       noexcept(noexcept(ranges::iter_move(i.@\exposid{current_}@)) &&
                is_nothrow_move_constructible_v<range_rvalue_reference_t<@\exposid{Base}@>>) {
       return tuple<difference_type,
-                   range_rvalue_reference_t<@\exposid{Base}@>>(@\exposid{pos_}@, ranges::iter_move(i.@\exposid{current_}@));
+                   range_rvalue_reference_t<@\exposid{Base}@>>(i.@\exposid{pos_}@, ranges::iter_move(i.@\exposid{current_}@));
     }
   };
 }
@@ -9885,7 +9885,7 @@
 
 \indexlibrarymember{operator-}{enumerate_view::\exposid{iterator}}%
 \begin{itemdecl}
-constexpr @\exposid{iterator}@ operator-(const @\exposid{iterator}@& x, difference_type y)
+friend constexpr @\exposid{iterator}@ operator-(const @\exposid{iterator}@& x, difference_type y)
   requires @\libconcept{random_access_range}@<@\exposid{Base}@>;
 \end{itemdecl}
 
@@ -9902,7 +9902,7 @@
 
 \indexlibrarymember{operator-}{enumerate_view::\exposid{iterator}}%
 \begin{itemdecl}
-constexpr difference_type operator-(const @\exposid{iterator}@& x, const @\exposid{iterator}@& y);
+friend constexpr difference_type operator-(const @\exposid{iterator}@& x, const @\exposid{iterator}@& y);
 \end{itemdecl}
 
 \begin{itemdescr}