fixup: correct the docs to use wrapping_offset()

Author: farnoy

library/core/src/intrinsics/simd.rs

@@ -249,7 +249,7 @@ extern "platform-intrinsic" {
     ///
     /// For each element, if the corresponding value in `mask` is `!0`, read the corresponding
     /// pointer offset from `ptr`.
-    /// The first element is loaded from `ptr`, the second from `ptr.offset(1)` and so on.
+    /// The first element is loaded from `ptr`, the second from `ptr.wrapping_offset(1)` and so on.
     /// Otherwise if the corresponding value in `mask` is `0`, return the corresponding value from
     /// `val`.
     ///
@@ -271,7 +271,7 @@ extern "platform-intrinsic" {
     ///
     /// For each element, if the corresponding value in `mask` is `!0`, write the corresponding
     /// value in `val` to the pointer offset from `ptr`.
-    /// The first element is written to `ptr`, the second to `ptr.offset(1)` and so on.
+    /// The first element is written to `ptr`, the second to `ptr.wrapping_offset(1)` and so on.
     /// Otherwise if the corresponding value in `mask` is `0`, do nothing.
     ///
     /// # Safety