Rephrase safety comment to avoid talking about the history of the win…

…dows-sys crate.

src/stream/windows.rs

@@ -73,9 +73,10 @@ struct EventHandle {
     state: EventHandleState,
 }
 
-// SAFETY: EventHandle is Send automatically if not for HANDLE, which is a [non-autotrait'ed] pointer since windows-sys was updated to 0.59.
-// The capture device owns the original handle,
-// As long as the capture device isn't released before the EventHandle, this should be good.
+// SAFETY: EventHandle needs to be Send because it's passed over a thread boundary.
+// It contains a HANDLE that is a raw pointer, so the Send autotrait doesn't apply.
+// The capture device owns the original handle; as long as the capture device isn't
+// released before the EventHandle, this should be good.
 unsafe impl Send for EventHandle {}
 
 /// Newtype used to wrap `HANDLE` to make it `Send`:able