[simd.overview] Remove noexcept

Author: hewillk

source/numerics.tex

@@ -17601,7 +17601,7 @@
     template<class U, class UAbi>
       constexpr explicit(@\seebelow@) basic_vec(const basic_vec<U, UAbi>&) noexcept;
     template<class G>
-      constexpr explicit basic_vec(G&& gen) noexcept;
+      constexpr explicit basic_vec(G&& gen);
     template<class R, class... Flags>
       constexpr basic_vec(R&& range, flags<Flags...> = {});
     template<class R, class... Flags>