Update spec/2023-07-draft.md

Co-authored-by: Harry Zhang <[email protected]>

Author: niemela

spec/2023-07-draft.md

@@ -977,7 +977,7 @@ Validation fails if any validator fails.
 
 An input validator program must be an application (executable or interpreted) capable of being invoked with a command line call.
 
-All input validators provided will be run on every test data file using the arguments specified for the test data group (or `sample, or `secret`) they are part of.
+All input validators provided will be run on every test data file using the arguments specified for the test data group (or `sample`, or `secret`) they are part of.
 Validation fails if any validator fails.
 
 When invoked, the input validator will get the input file on stdin.