Backport of Fix formatting codeblocks on APIgw docs into release/1.16…

….x (#17972)

* backport of commit 1c8b715

* backport of commit 0d690d9

---------

Co-authored-by: Tu Nguyen <im2nguyen@gmail.com>

website/content/docs/api-gateway/usage/usage.mdx

@@ -22,21 +22,21 @@ Configure your [`Gateway`](/consul/docs/api-gateway/configuration/gateway) and [
 
   <CodeBlockConfig hideClipboard filename="values.yaml">
 
-    ```yaml
-      apiGateway:
-        enabled: true
-        managedGatewayClass:
-    ```
+  ```yaml
+    apiGateway:
+      enabled: true
+      managedGatewayClass:
+  ```
 
   </CodeBlockConfig>
 
 ## Apply configurations
 
 Issue the `kubectl apply` command to implement the configurations:
 
-  ```shell-session
-    $ kubectl apply -f gateway.yaml routes.yaml
-  ```
+```shell-session
+$ kubectl apply -f gateway.yaml routes.yaml
+```
 
 
 <!--- Commented out per https://github.com/hashicorp/consul/pull/11951/files#r791204596