input: Write a python function to scrape and print headlines and their corresponding descriptions from a given URL using BeautifulSoup.
  assert scrape_headlines('https://www.readersdigest.com/features/fun-facts') is None
output: def scrape_headlines(url):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
      
      articles = soup.find_all('article')
      
      for article in articles:
          headline = article.find('h2')
          description = article.find('p')
          
          if headline and description:
              print(f"Headline: {headline.get_text(strip=True)}")
              print(f"Description: {description.get_text(strip=True)}\n")