Clean up description of DEFLATE_ON_OOM feature

Co-authored-by: Martin Kröning <[email protected]>

Author: hcsch

src/features.rs

@@ -539,9 +539,13 @@ pub mod balloon {
             #[doc(alias = "VIRTIO_BALLOON_F_STATS_VQ")]
             const STATS_VQ = 1 << 1;
 
-            /// Deflate of the balloon is always? permitted on guest out of memory condition.
+            /// Deflate balloon on guest out of memory condition.
             ///
-            /// TODO: Spec is a bit confusing on this feature, see <https://github.com/oasis-tcs/virtio-spec/issues/228>
+            /// <div class="warning">
+            ///
+            /// The specification is a bit confusing on this feature, see [oasis-tcs/virtio-spec#228](https://github.com/oasis-tcs/virtio-spec/issues/228).
+            ///
+            /// </div>
             #[doc(alias = "VIRTIO_BALLOON_F_DEFLATE_ON_OOM")]
             const DEFLATE_ON_OOM = 1 << 2;