add return type to naked function example

Author: folkertdev

content/Rust-1.88.0.md

@@ -50,7 +50,7 @@ For example:
 
 ```rust
 #[unsafe(naked)]
-pub unsafe extern "sysv64" fn wrapping_add(a: u64, b: u64) {
+pub unsafe extern "sysv64" fn wrapping_add(a: u64, b: u64) -> u64 {
     // Equivalent to `a.wrapping_add(b)`.
     core::arch::naked_asm!(
         "add rax, rdi, rsi",