[atomics.types.generic.general] Replace "same_as" with "is_same_v" (#8538)

Author: eisenwave

source/threads.tex

@@ -4455,7 +4455,7 @@
 \item \tcode{is_move_constructible_v<T>},
 \item \tcode{is_copy_assignable_v<T>},
 \item \tcode{is_move_assignable_v<T>}, or
-\item \tcode{same_as<T, remove_cv_t<T>>},
+\item \tcode{is_same_v<T, remove_cv_t<T>>},
 \end{itemize}
 is \tcode{false}.
 \begin{note}