Update test output.

src/test/ui/async-await/proper-span-for-type-error.fixed

@@ -5,7 +5,8 @@
 async fn a() {}
 
 async fn foo() -> Result<(), i32> {
-    Ok(a().await) //~ ERROR mismatched types
+    a().await;
+    Ok(()) //~ ERROR mismatched types
 }
 
 fn main() {}

src/test/ui/async-await/proper-span-for-type-error.stderr

@@ -6,10 +6,11 @@ LL |     a().await
    |
    = note:   expected enum `Result<(), i32>`
            found unit type `()`
-help: try wrapping the expression in `Ok`
+help: try adding an expression at the end of the block
+   |
+LL ~     a().await;
+LL ~     Ok(())
    |
-LL |     Ok(a().await)
-   |     +++         +
 
 error: aborting due to previous error