docs: Update directory and change kata_tap0 to tap0_kata

Update directory about state and tap device's should be tap0_kata for architecture.md

Fixes: kata-containers#736

Signed-off-by: duanquanfeng <duanquanfeng_yewu@cmss.chinamobile.com>

design/architecture.md

@@ -17,6 +17,7 @@
         * [exec](#exec)
         * [kill](#kill)
         * [delete](#delete)
+        * [state](#state)
 * [Proxy](#proxy)
 * [Shim](#shim)
 * [Networking](#networking)
@@ -397,9 +398,9 @@ interfaces with `TAP` ones using Traffic Control:
 
 With TC filter in place, a redirection is created between the container network and the
 virtual machine. As an example, the CNI may create a device, `eth0`, in the container's network
-namespace, which is a VETH device. Kata Containers will create a tap device for the VM, `kata_tap0`,
-and setup a TC redirection filter to mirror traffic from `eth0`'s ingress to `kata_tap0`'s egress,
-and a second to mirror traffic from `kata_tap0`'s ingress to `eth0`'s egress.
+namespace, which is a VETH device. Kata Containers will create a tap device for the VM, `tap0_kata`,
+and setup a TC redirection filter to mirror traffic from `eth0`'s ingress to `tap0_kata`'s egress,
+and a second to mirror traffic from `tap0_kata`'s ingress to `eth0`'s egress.
 
 Kata maintains support for MACVTAP, which was an earlier implementation used in Kata. TC-filter
 is the default because it allows for simpler configuration, better CNI plugin compatibility, and performance