small improvements to docs and variables

utils/helpers.py

@@ -58,7 +58,7 @@ class AsyncCrawler(object):
         async with self.semaphore:
             async with self.client_session.head(url, timeout=5) as head:
                 try:
-                    data = await head.read()
+                    _ = await head.read()
                 except Exception as e:
                     print(e)
             if 'text/html' in head.headers['Content-Type']:
@@ -130,7 +130,7 @@ class AsyncCrawler(object):
         print('Crawling: {0}'.format(self.baseurl))
         while len(to_crawl) > 0:
             discovered_urls = await self.run(urls=to_crawl)
-            # empty toe crawl list and then add all newly discovered URLs for
+            # empty to_crawl list and then add all newly discovered URLs for
             # the next iteration.
             to_crawl.clear()
             to_crawl.extend(discovered_urls)