[PATCH v2] virtio: update the comments for transport features

[Tiwei Bie]

The existing comments for transport features are out dated.
So update them to address the latest changes in the spec.

Suggested-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Tiwei Bie <tiwei.bie@xxxxxxxxx>
---
This patch is generated on top of below patch:
https://lists.oasis-open.org/archives/virtio-dev/201805/msg00212.html

v2:
- Improve the comments (Cornelia);
- Improve the commit message;

 include/uapi/linux/virtio_config.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index b7c1f4e7d59e..449132c76b1c 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -45,9 +45,12 @@
 /* We've given up on this device. */
 #define VIRTIO_CONFIG_S_FAILED		0x80
 
-/* Some virtio feature bits (currently bits 28 through 32) are reserved for the
- * transport being used (eg. virtio_ring), the rest are per-device feature
- * bits. */
+/*
+ * Virtio feature bits VIRTIO_TRANSPORT_F_START through
+ * VIRTIO_TRANSPORT_F_END are reserved for the transport
+ * being used (e.g. virtio_ring, virtio_pci etc.), the
+ * rest are per-device feature bits.
+ */
 #define VIRTIO_TRANSPORT_F_START	28
 #define VIRTIO_TRANSPORT_F_END		38
 
-- 
2.17.0