Update quickstart

docs/source/quickstart.md

@@ -299,8 +299,8 @@ model = Model2Model.from_pretrained('fine-tuned-weights')
 model.eval()
 
 # If you have a GPU, put everything on cuda
-question_tensor = encoded_question.to('cuda')
-answer_tensor = encoded_answer.to('cuda')
+question_tensor = question_tensor.to('cuda')
+answer_tensor = answer_tensor.to('cuda')
 model.to('cuda')
 
 # Predict all tokens