docs(academy): clarify Amazon challenge to scrape all offers (#1390)

Co-authored-by: Michał Olender <[email protected]>

sources/academy/webscraping/scraping_basics_javascript/challenge/index.md

@@ -40,7 +40,7 @@ Our crawler's input will look like this:
 }
 ```
 
-The goal at hand is to scrape all of the products from the first page of results for whatever keyword was provided (for our test case, it will be **iphone**), then to scrape each offer of each product, and push the results to the dataset. For context, the offers for a product look like this:
+The goal at hand is to scrape all of the products from the first page of results for whatever keyword was provided (for our test case, it will be **iPhone**), then to scrape all available offers of each product and push the results to the dataset. For context, the offers for a product look like this:
 
 ![Amazon product offers](../../../platform/expert_scraping_with_apify/images/product-offers.jpg)