fix indent issue

website/content/docs/api-gateway/configuration/routes.mdx

@@ -23,15 +23,15 @@ The following example creates a route named `example-route` associated with a li
   apiVersion: gateway.networking.k8s.io/v1alpha2
   kind: HTTPRoute
   metadata:
-  name: example-route
+    name: example-route
   spec:
-  parentRefs:
+    parentRefs:
-  - name: example-gateway
+    - name: example-gateway
-  rules:
+    rules:
-  - backendRefs:
+    - backendRefs:
-  - kind: Service
+      - kind: Service
-  name: echo
+        name: echo
-  port: 8080
+        port: 8080
   ```
 
 </CodeBlockConfig>