Use .await syntax instead of await!

src/libcore/future/future.rs

@@ -21,7 +21,7 @@ use crate::task::{Context, Poll};
 /// task.
 ///
 /// When using a future, you generally won't call `poll` directly, but instead
-/// `await!` the value.
+/// `.await` the value.
 #[doc(spotlight)]
 #[must_use = "futures do nothing unless you `.await` or poll them"]
 #[stable(feature = "futures_api", since = "1.36.0")]