[range.filter.iterator] Add missing \exposid formatting

Author: jensmaurer

source/ranges.tex

@@ -3970,7 +3970,7 @@
 satisfy the filter predicate.
 
 \pnum
-\tcode{iterator::iterator_concept} is defined as follows:
+\tcode{\exposid{iterator}::iterator_concept} is defined as follows:
 \begin{itemize}
 \item If \tcode{V} models \libconcept{bidirectional_range}, then
 \tcode{iterator_concept} denotes \tcode{bidirectional_iterator_tag}.
@@ -4032,7 +4032,7 @@
 \begin{itemdescr}
 \pnum
 \effects
-Equivalent to: \tcode{return std::move(current_);}
+Equivalent to: \tcode{return std::move(\exposid{current_});}
 \end{itemdescr}
 
 \indexlibrarymember{operator*}{filter_view::iterator}%