Fix a typo

Author: yutannihilation

posts/2024-09-05-Rust-1.81.0.md

@@ -140,7 +140,7 @@ This completes the transition started in [1.71](https://blog.rust-lang.org/2023/
 which added dedicated `"C-unwind"` (amongst other `-unwind` variants) ABIs for
 when unwinding across the ABI boundary is expected. As of 1.81, the non-unwind
 ABIs (e.g., `"C"`) will now abort on uncaught unwinds, closing the longstanding
-soundess problem.
+soundness problem.
 
 Programs relying on unwinding should transition to using `-unwind` suffixed ABI
 variants.