Update docs/guides/http_crawlers.mdx

Co-authored-by: Vlada Dusek <v.dusek96@gmail.com>

Author: Mantisus

docs/guides/http_crawlers.mdx

@@ -97,7 +97,7 @@ The <ApiLink to="class/HttpCrawler">`HttpCrawler`</ApiLink> provides direct acce
     {HttpExample}
 </RunnableCodeBlock>
 
-## Using HttpCrawler with a custom parser
+### Using custom parsers
 
 Since <ApiLink to="class/HttpCrawler">`HttpCrawler`</ApiLink> provides raw HTTP responses, you can integrate any parsing library. Note that helpers like <ApiLink to="class/EnqueueLinksFunction">`enqueue_links`</ApiLink> and <ApiLink to="class/ExtractLinksFunction">`extract_links`</ApiLink> are not available with this approach.