improve internal fastfail explainer

Author: joboet

library/std/src/sys/pal/windows/mod.rs

@@ -330,9 +330,8 @@ pub fn dur2timeout(dur: Duration) -> u32 {
 ///
 /// In Windows 8 and later, this will terminate the process immediately without
 /// running any in-process exception handlers. In earlier versions of Windows,
-/// this sequence of instructions will be treated as an access violation,
-/// terminating the process but without necessarily bypassing all exception
-/// handlers.
+/// this sequence of instructions will be treated as an access violation, which
+/// will still terminate the process but might run some exception handlers.
 ///
 /// https://docs.microsoft.com/en-us/cpp/intrinsics/fastfail
 #[cfg(not(miri))] // inline assembly does not work in Miri