Fixed typo in import statement of tutorial

docs/tutorial/2-requests-and-responses.md

@@ -41,8 +41,8 @@ We don't need our `JSONResponse` class anymore, so go ahead and delete that.  On
     from rest_framework import status
     from rest_framework.decorators import api_view
     from rest_framework.response import Response
-    from snippet.models import Snippet
-    from snippet.serializers import SnippetSerializer
+    from snippets.models import Snippet
+    from snippets.serializers import SnippetSerializer
 
 
     @api_view(['GET', 'POST'])