[hive.cons] Add noexcept to move constructor (cplusplus#8154)

The synopsis specifies noexcept for this constructor (and the effects
don't invoke behavior that could throw), so the missing noexcept on the
\itemdecl looks like an oversight in P0447R28.

Author: birbacher

source/containers.tex

@@ -8281,7 +8281,7 @@
 
 \indexlibraryctor{hive}%
 \begin{itemdecl}
-hive(hive&& x);
+hive(hive&& x) noexcept;
 hive(hive&& x, const type_identity_t<Allocator>& alloc);
 \end{itemdecl}