docs: update tcp guide for v1alpha2

examples/v1alpha2/basic-tcp.yaml

@@ -0,0 +1,45 @@
+kind: Gateway
+apiVersion: gateway.networking.k8s.io/v1alpha2
+metadata:
+  name: my-tcp-gateway
+spec:
+  gatewayClassName: my-tcp-gateway-class
+  listeners:
+  - name: foo
+    protocol: TCP
+    port: 8080
+    routes:
+      kinds:
+      - kind: TCPRoute
+  - name: bar
+    protocol: TCP
+    port: 8090
+    routes:
+      kinds:
+      - kind: TCPRoute
+---
+kind: TCPRoute
+apiVersion: gateway.networking.k8s.io/v1alpha2
+metadata:
+  name: tcp-app-1
+spec:
+  parentRefs:
+  - name: my-tcp-gateway
+    sectionName: foo
+  rules:
+  - backendRefs:
+    - name: my-foo-service
+      port: 6000
+---
+kind: TCPRoute
+apiVersion: gateway.networking.k8s.io/v1alpha2
+metadata:
+  name: tcp-app-2
+spec:
+  parentRefs:
+  - name: my-tcp-gateway
+    sectionName: bar
+  rules:
+  - backendRefs:
+    - name: my-bar-service
+      port: 6000

site-src/v1alpha2/guides/tcp.md

@@ -1,7 +1,3 @@
-
-!!! danger
-    This page has not been updated for v1alpha2 yet.
-
 Gateway API is designed to work with multiple protocols.
 [TCPRoute](/v1alpha2/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.TCPRoute) is one such route which
 allows for managing TCP traffic.
@@ -17,7 +13,7 @@ distribute the traffic with the following rules:
 Please note the following:
 
 - The `protocol` of listeners on the Gateway is `TCP`.
-- Each listener selects exactly one TCPRoute. This is important since the routing
+- Each `TCPRoute` selects exactly one listener. This is important since the routing
   decision is performed based on destination port only. If more metadata is used
   for routing decisions, then one may associate multiple TCPRoutes to a single
   Gateway listener. Implementations can support such use-cases by adding a custom
@@ -26,5 +22,5 @@ Please note the following:
   be resolved as per the [conflict resolution](/v1alpha2/concepts/guidelines#conflicts) guidelines.
 
 ```
-{% include 'v1alpha1/basic-tcp.yaml' %}
+{% include 'v1alpha2/basic-tcp.yaml' %}
 ```