Fixes an import statement in chapter 5 of the tutorial. (#6267)

Author: tsnee

docs/tutorial/5-relationships-and-hyperlinked-apis.md

@@ -106,7 +106,7 @@ If we're going to have a hyperlinked API, we need to make sure we name our URL p
 
 After adding all those names into our URLconf, our final `snippets/urls.py` file should look like this:
 
-    from django.conf.urls import url, include
+    from django.urls import path
     from rest_framework.urlpatterns import format_suffix_patterns
     from snippets import views