Improve generic type name

Co-authored-by: Jubilee <[email protected]>

Author: calebzulawski

library/core/src/intrinsics/simd.rs

@@ -219,14 +219,14 @@ extern "platform-intrinsic" {
     ///
     /// `U` must be a vector of pointers to the element type of `T`, with the same length as `T`.
     ///
-    /// `V` must be a vector of integers with the same length as `T` (but any element size).
+    /// `M` must be a vector of integers with the same length as `T` (but any element size).
     ///
     /// # Safety
     /// Unmasked values in `T` must be writeable as if by `<ptr>::write` (e.g. aligned to the element
     /// type).
     ///
     /// `mask` must only contain `0` or `!0` values.
-    pub fn simd_scatter<T, U, V>(val: T, ptr: U, mask: V);
+    pub fn simd_scatter<T, U, M>(val: T, ptr: U, mask: M);
 
     /// Add two simd vectors elementwise, with saturation.
     ///