fix spacing

Author: jjarvisp

src/pages/[platform]/build-a-backend/storage/list-files/index.mdx

@@ -67,24 +67,23 @@ If the `pageSize` is set lower than the total file size, a single `list` call on
 import { list } from 'aws-amplify/storage';
 
 const PAGE_SIZE = 20;
-let nextToken = undefined;
-//...
+let nextToken;
+// ...
 const loadNextPage = async () => {
-  let response = await list({
-    path: 'photos/',
-    // Alternatively, path: ({ identityId }) => `album/{identityId}/photos/`
-    options: {
-        pageSize: PAGE_SIZE,
-        nextToken: nextToken
-      }
-    }
-  });
-  if (response.nextToken) {
-    nextToken = response.nextToken;
-  } else {
-    nextToken = undefined;
-  }
-  // render list items from response.items
+	const response = await list({
+		path: 'photos/',
+		// Alternatively, path: ({ identityId }) => `album/{identityId}/photos/`
+		options: {
+			pageSize: PAGE_SIZE,
+			nextToken,
+		},
+	});
+	if (response.nextToken) {
+		nextToken = response.nextToken;
+	} else {
+		nextToken = undefined;
+	}
+	// render list items from response.items
 };
 ```