more --blessing + test error annotations fixes

src/test/ui/async-await/async-block-control-flow-static-semantics.rs

@@ -30,14 +30,14 @@ async fn return_targets_async_block_not_async_fn() -> u8 {
 
 fn no_break_in_async_block() {
     async {
-        break 0u8; //~ ERROR `break` inside of an async block
+        break 0u8; //~ ERROR `break` inside of an `async` block
     };
 }
 
 fn no_break_in_async_block_even_with_outer_loop() {
     loop {
         async {
-            break 0u8; //~ ERROR `break` inside of an async block
+            break 0u8; //~ ERROR `break` inside of an `async` block
         };
     }
 }