Revert "Update `doc_to_text` to show candidate fill-ins"

This reverts commit 5d431ba9.

lm_eval/tasks/hellaswag.py

-import re
 import numpy as np
 from ..base import rf, mean
 from . common import HFTask
@@ -35,9 +34,7 @@ class HellaSwag(HFTask):
             "plausibly completes the situation."
 
     def doc_to_text(self, doc):
-        text = doc['activity_label'] + ': ' + doc['ctx'] + '\n'
-        text += ''.join([ending + "\n" for ending in doc['endings']])
-        return text + "\n" 
+        return doc['activity_label'] + ': ' + doc['ctx'] + '\n'
 
     def doc_to_target(self, doc):
         letter_answer = doc['label']