[range.filter.iterator] Avoid "defining" typedef-names

Use "determine"/"declared" instead.

Author: frederick-vs-ja

source/ranges.tex

@@ -4759,7 +4759,7 @@
 satisfy the filter predicate.
 
 \pnum
-\tcode{\exposid{iterator}::iterator_concept} is defined as follows:
+\tcode{\exposid{iterator}::iterator_concept} is determined as follows:
 \begin{itemize}
 \item If \tcode{V} models \libconcept{bidirectional_range}, then
 \tcode{iterator_concept} denotes \tcode{bidirectional_iterator_tag}.
@@ -4771,10 +4771,10 @@
 \end{itemize}
 
 \pnum
-The member \grammarterm{typedef-name} \tcode{iterator_category} is defined
+The member \grammarterm{typedef-name} \tcode{iterator_category} is declared
 if and only if \tcode{V} models \libconcept{forward_range}.
 In that case,
-\tcode{\exposid{iterator}::iterator_category} is defined as follows:
+\tcode{\exposid{iterator}::iterator_category} is determined as follows:
 \begin{itemize}
 \item Let \tcode{C} denote the type
 \tcode{iterator_traits<iterator_t<V>>::iterator_category}.