[range.join.with.iterator] Fix typo (#7131)

Author: hewillk

source/ranges.tex

@@ -7258,7 +7258,7 @@
 \item
 Otherwise,
 if \placeholder{OUTERC}, \placeholder{INNERC}, and \placeholder{PATTERNC}
-each model \tcode{\libconcept{derived_from}<bidirectional_iterator_category>}
+each model \tcode{\libconcept{derived_from}<bidirectional_iterator_tag>}
 and \exposid{InnerBase} and \exposid{PatternBase}
 each model \libconcept{common_range},
 \tcode{iterator_cate\-gory} denotes \tcode{bidirectional_iterator_tag}.