Fix comments from Joshua

Author: niemela

spec/2023-07-draft.md

@@ -559,7 +559,7 @@ The assumption of determinism means that a judge system could choose to reuse th
 
 Test cases and [test data groups](#test-data-groups) will be used in lexicographical order on base name.
 It is good practice to use a numbered prefix such as `00`, `01`, `02`, `03`, and so on, to get the desired order of test cases, while keeping the file names descriptive.
-Remember that the numbered prefixes should be zer padded to the same length to get the expected lexicographical order.
+Remember that the numbered prefixes should be zero padded to the same length to get the expected lexicographical order.
 
 ### Test Data Configuration
 
@@ -578,7 +578,7 @@ Key                     | Type                                | Default
 ### Test Data Groups
 
 The secret data may be sudivided into test data groups.
-A test data group is a subdirectory of `data/secret/` and may contain a `test_group.yaml` configuration file.
+Every subdirectory of `data/secret/` is a test data group and may contain a `test_group.yaml` configuration file.
 `data/secret` can only have test data groups *or* test cases, never both.
 That is, if there are any directories under `data/secret/` there must not be any `.in` files directly in `data/secret/` and vice versa.
 
@@ -1321,7 +1321,7 @@ The score of `secret` is determined by its groups or test cases (it can only hav
 The score of a test group is determined by test cases.
 The score depends on the aggregation mode, which is either `pass-fail`, `sum`, or `min`.
 
-- If a group uses `pass-fail` aggregation, the group must have bounded maximum score .
+- If a group uses `pass-fail` aggregation, the group must have bounded maximum score.
 If the submission receives an accepted verdict for all test cases or groups in the group,
 the score of the group is equal to its maximum possible score.
 Otherwise the group score is 0.