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

Use "determine"/"declare" instead.

Author: frederick-vs-ja

source/ranges.tex

@@ -5226,7 +5226,7 @@
 \end{codeblock}
 
 \pnum
-\tcode{\exposid{iterator}::iterator_concept} is defined as follows:
+\tcode{\exposid{iterator}::iterator_concept} is determined as follows:
 \begin{itemize}
 \item If \exposid{Base} models \libconcept{random_access_range}, then
 \tcode{iterator_concept} denotes \tcode{random_access_iterator_tag}.
@@ -5241,10 +5241,10 @@
 \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 \exposid{Base} 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:
 Let \tcode{C} denote the type
 \tcode{iterator_traits<iterator_t<\exposid{Base}>>::iterator_category}.
 \begin{itemize}