Update empty_enum.stderr

Author: flip1995

tests/ui/empty_enum.stderr

@@ -5,11 +5,7 @@ LL | enum Empty {}
    | ^^^^^^^^^^^^^
    |
    = note: `-D clippy::empty-enum` implied by `-D warnings`
-help: consider using the uninhabited type `!` (never type) or a wrapper around it to introduce a type which can't be instantiated
-  --> $DIR/empty_enum.rs:4:1
-   |
-LL | enum Empty {}
-   | ^^^^^^^^^^^^^
+   = help: consider using the uninhabited type `!` (never type) or a wrapper around it to introduce a type which can't be instantiated
 
 error: aborting due to previous error