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

Use "determine"/"declare" instead.

Author: frederick-vs-ja

source/ranges.tex

@@ -15576,7 +15576,7 @@
 \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},
@@ -15592,10 +15592,10 @@
 \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:
 \begin{itemize}
 \item
 Let \tcode{C} denote