revert: undo kubectl delete syntax change

Reverting kubectl command back to original syntax as requested.

Author: Kunal1522

docs/versioned/eventing/channels/subscriptions.md

@@ -224,7 +224,7 @@ You can delete a Subscription by using the `kn` or `kubectl` CLI tools.
 
 === "kubectl"
     ```bash
-    kubectl delete subscription <subscription-name>
+    kubectl subscription delete <subscription-name>
     ```
 
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