[range.move.wrap] Fix constraint (move, not copy-constructible)

This was accidentally omitted from previous changes requested by P2494R2.

Author: tkoeppe

source/ranges.tex

@@ -4124,7 +4124,7 @@
 \begin{itemize}
 \item \tcode{\exposid{movable-box}<T>} constrains
 its type parameter \tcode{T} with
-\tcode{\libconcept{copy_constructible}<T> \&\& is_object_v<T>}.
+\tcode{\libconcept{move_constructible}<T> \&\& is_object_v<T>}.
 
 \item The default
 constructor of \tcode{\exposid{movable-box}<T>} is equivalent to: