[range.chunk.view.input] Add missing \exposid (#5529)

Author: hewillk

source/ranges.tex

@@ -11041,8 +11041,8 @@
 \effects
 Equivalent to:
 \begin{codeblock}
-current_ = ranges::begin(base_);
-remainder_ = n_;
+@\exposid{current_}@ = ranges::begin(@\exposid{base_}@);
+@\exposid{remainder_}@ = @\exposid{n_}@;
 return @\exposid{outer-iterator}@(*this);
 \end{codeblock}
 \end{itemdescr}