academy: Fix incorrect/old code

Author: mstephen19

content/academy/web_scraping_for_beginners/challenge/scraping_amazon.md

@@ -93,7 +93,7 @@ router.addHandler(labels.OFFERS, async ({ $, request }) => {
     for (const offer of $('#aod-offer')) {
         const element = $(offer);
 
-        await Actor.pushData({
+        await Dataset.pushData({
             ...data,
             sellerName: element.find('div[id*="soldBy"] a[aria-label]').text().trim(),
             offer: element.find('.a-price .a-offscreen').text().trim(),
@@ -181,7 +181,7 @@ router.addHandler(labels.OFFERS, async ({ $, request }) => {
     for (const offer of $('#aod-offer')) {
         const element = $(offer);
 
-        await Actor.pushData({
+        await Dataset.pushData({
             ...data,
             sellerName: element.find('div[id*="soldBy"] a[aria-label]').text().trim(),
             offer: element.find('.a-price .a-offscreen').text().trim(),

content/academy/web_scraping_for_beginners/crawling/processing_data.md

@@ -23,7 +23,9 @@ To access the default dataset, we can use the  [`Dataset`](https://crawlee.dev/a
 // dataset.js
 import { Dataset } from 'crawlee';
 
-const { items } = await Dataset.getData();
+const dataset = await Dataset.open();
+
+const { items } = await dataset.getData();
 console.log(items.length);
 ```