rm stray commas

Author: Etienne Vouga

spec/2023-07-draft.md

@@ -1357,7 +1357,7 @@ It is a judge error if the score of `secret` or any test data group exceeds its
 
 #### Required Dependent Groups
 
-A test data group, or `secret` may specify that it depends on some other test data groups, or `sample`.
+A test data group or `secret` may specify that it depends on some other test data groups or `sample`.
 Each required group must be either `sample` or have `pass-fail` aggregation.
 The dependent group will only be run if the group being depended on receives an accepted verdict for all test cases in the group.
 If the dependent group is not run, the group score is 0.