check_test_cases: Minor documentation change

 * Make an iteration comment generic to every file it may affect
   instead of making it specific a particular file.

Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>
diff --git a/tests/scripts/check_test_cases.py b/tests/scripts/check_test_cases.py
index 4a3ecef..30879d7 100755
--- a/tests/scripts/check_test_cases.py
+++ b/tests/scripts/check_test_cases.py
@@ -107,7 +107,7 @@
         # test case description between --list-test-cases and its OUTCOME.CSV
         #
         # idx indicates the number of test case since there is no line number
-        # in `compat.sh` for each test case.
+        # in the script for each test case.
         for idx, description in enumerate(listed.splitlines()):
             self.process_test_case(descriptions,
                                    file_name,