Change max score to max_score

Author: Matistjati

spec/2023-07-draft.md

@@ -1350,7 +1350,7 @@ Otherwise the group score is 0.
 
 The submission score is the score of the `secret` group. 
 
-It is a judge error if the score of any group or subgroup exceeds its maximum score.
+It is a judge error if the score of any group or subgroup exceeds its `max_score`.
 
 #### Required Dependent Groups