From: QuietMisdreavus <grey@quietmisdreavus.net>
Backported from https://github.com/rust-lang/stdarch/pull/466/commits/072a51187df3ed7bb9f1f200be65ecef33b88c76

diff --git a/src/stdsimd/coresimd/mod.rs b/src/stdsimd/coresimd/mod.rs
index c35eb418..939417ba 100644
--- a/src/stdsimd/coresimd/mod.rs
+++ b/src/stdsimd/coresimd/mod.rs
@@ -86,13 +86,17 @@ pub mod arch {
 mod simd_llvm;

 #[cfg(any(target_arch = "x86", target_arch = "x86_64", dox))]
+#[doc(cfg(any(target_arch = "x86", target_arch = "x86_64")))]
 mod x86;
 #[cfg(any(target_arch = "x86_64", dox))]
+#[doc(cfg(target_arch = "x86_64"))]
 mod x86_64;

 #[cfg(any(target_arch = "arm", target_arch = "aarch64", dox))]
+#[doc(cfg(any(target_arch = "arm", target_arch = "aarch64")))]
 mod arm;
 #[cfg(any(target_arch = "aarch64", dox))]
+#[doc(cfg(target_arch = "aarch64"))]
 mod aarch64;
 #[cfg(target_arch = "wasm32")]
 mod wasm32;