Update lifecycle.mdx (#21014)

Author: GregBrimble

src/content/docs/workers/runtime-apis/rpc/lifecycle.mdx

@@ -47,7 +47,7 @@ function sendEmail(id, message) {
 
 ### How to use the `using` declaration in your Worker
 
-[Wrangler](/workers/wrangler/) v4+ supports the `using` keyword natively. If you are on an earlier version of Wrangler, you can alternatively call dispose of resources manually.
+[Wrangler](/workers/wrangler/) v4+ supports the `using` keyword natively. If you are using an earlier version of Wrangler, you will need to manually dispose of resources instead.
 
 The following code: