fix typo in comment

Author: h3fang

library/std_detect/src/detect/os/linux/aarch64.rs

@@ -212,7 +212,7 @@ impl From<auxvec::AuxVec> for AtHwcap {
 
         // Hardware capabilities from bits 32 to 63 should only
         // be tested on LP64 targets with 64 bits `usize`.
-        // On ILP32 targets like `aarch64-unknown-linux-gun_ilp32`,
+        // On ILP32 targets like `aarch64-unknown-linux-gnu_ilp32`,
         // these hardware capabilities will default to `false`.
         // https://github.com/rust-lang/rust/issues/146230
         #[cfg(target_pointer_width = "64")]