fix unnecessary unsafe error in doctest

Author: RalfJung

crates/core_arch/src/x86/sse41.rs

@@ -189,13 +189,13 @@ pub fn _mm_blend_ps<const IMM4: i32>(a: __m128, b: __m128) -> __m128 {
 /// # fn main() {
 /// #    if is_x86_feature_detected!("sse4.1") {
 /// #       #[target_feature(enable = "sse4.1")]
-/// #       unsafe fn worker() { unsafe {
+/// #       unsafe fn worker() {
 /// let mut float_store = vec![1.0, 1.0, 2.0, 3.0];
 /// let simd_floats = _mm_set_ps(2.5, 5.0, 7.5, 10.0);
 /// let x: i32 = _mm_extract_ps::<2>(simd_floats);
 /// float_store.push(f32::from_bits(x as u32));
 /// assert_eq!(float_store, vec![1.0, 1.0, 2.0, 3.0, 5.0]);
-/// #       }}
+/// #       }
 /// #       unsafe { worker() }
 /// #   }
 /// # }