remove async IIFE section

Author: audionerd

docs/actors.mdx

@@ -440,43 +440,6 @@ const machine = createMachine({
 });
 ```
 
-To use `async`/`await`, you may find it more expressive to wrap your code in an [asynchronous immediately invoked function expression (IIFE)](https://developer.mozilla.org/en-US/docs/Glossary/IIFE#execute_an_async_function).
-
-```ts
-const machine = createMachine({
-  initial: 'running',
-  states: {
-    running: {
-      invoke: {
-        src: fromCallback(({ sendBack }) => {
-          // highlight-start
-          (async () => {
-            try {
-              const data = await somePromise();
-              sendBack({ type: 'done', data });
-            } catch (error) {
-              sendBack({ type: 'error', data: error });
-            }
-          })();
-          // highlight-end
-
-          return () => {
-            /* cleanup function */
-          };
-        })
-      },
-      // highlight-start
-      on: {
-        error: {
-          actions: ({ event }) => console.error(event.data)
-        }
-      }
-      // highlight-end
-    }
-  }
-});
-```
-
 ## Higher-level actor logic
 
 Higher-level actor logic enhances existing actor logic with additional functionality. For example, you can create actor logic that logs or persists actor state: