[range.concat.iterator] Remove stray hyphen (#7171)

Author: Eelis

source/ranges.tex

@@ -8850,7 +8850,7 @@
 \tcode{iterator_category} denotes \tcode{random_access_iterator_tag}.
 \item
 Otherwise, if
-\tcode{(\libconcept{derived_from}<Cs, bidirectional_iterator_tag> \&\& ...) \&\& \exposconceptx{concat-is--\linebreak{}bidirectional}{concat-is-bidirectional}<Const, Views...>}
+\tcode{(\libconcept{derived_from}<Cs, bidirectional_iterator_tag> \&\& ...) \&\& \exposconceptx{concat-is-\linebreak{}bidirectional}{concat-is-bidirectional}<Const, Views...>}
 is \tcode{true},
 \tcode{iterator_category} denotes \tcode{bidirectional_iter\-ator_tag}.
 \item