docs: update plugin metadata APISIX CRD example (apache#2687)

Author: kayx23

docs/en/latest/reference/example.md

@@ -916,6 +916,18 @@ values={[
 
 <TabItem value="gateway">
 
+<!-- leave this section empty -->
+
+</TabItem>
+
+<TabItem value="apisix-crd">
+
+<!-- leave this section empty -->
+
+</TabItem>
+
+</Tabs>
+
 ```yaml
 apiVersion: apisix.apache.org/v1alpha1
 kind: GatewayProxy
@@ -952,16 +964,6 @@ spec:
     }
 ```
 
-</TabItem>
-
-<TabItem value="apisix-crd">
-
-Not currently supported.
-
-</TabItem>
-
-</Tabs>
-
 ## Configure Plugin Config
 
 To create a plugin config and reference it in a route: