virtio-devices: fix documentation formatting

Signed-off-by: Wei Liu <liuwe@microsoft.com>

virtio-devices/src/vsock/packet.rs

@@ -7,6 +7,7 @@
 //! virtio queue:
 //! - the packet header; and
 //! - the packet data/buffer.
+//!
 //! There is a 1:1 relation between descriptor chains and packets: the first (chain head) holds
 //! the header, and an optional second descriptor holds the data. The second descriptor is only
 //! present for data packets (VSOCK_OP_RW).

virtio-devices/src/vsock/unix/muxer_rxq.rs

@@ -71,6 +71,7 @@ impl MuxerRxQ {
     /// A push will fail when:
     /// - trying to push a connection key onto an out-of-sync, or full queue; or
     /// - trying to push an RST onto a queue already full of RSTs.
+    ///
     /// RSTs take precedence over connections, because connections can always be queried for
     /// pending RX data later. Aside from this queue, there is no other storage for RSTs, so
     /// failing to push one means that we have to drop the packet.