Fix comment on the SEH personality function

Author: Amanieu

library/panic_unwind/src/seh.rs

@@ -325,8 +325,8 @@ pub unsafe fn cleanup(payload: *mut u8) -> Box<dyn Any + Send> {
 }
 
 // This is required by the compiler to exist (e.g., it's a lang item), but
-// it's never actually called by the compiler because __C_specific_handler
-// or _except_handler3 is the personality function that is always used.
+// it's never actually called by the compiler because _CxxFrameHandler3
+// is the personality function that is always used.
 // Hence this is just an aborting stub.
 #[lang = "eh_personality"]
 #[cfg(not(test))]