Change comments and styles base on review

Change-Id: Idde76114aba0a47b61355677dd33ea9de7deee9d
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/tests/scripts/generate_tls13_compat_tests.py b/tests/scripts/generate_tls13_compat_tests.py
index 995bbdd..457a81d 100755
--- a/tests/scripts/generate_tls13_compat_tests.py
+++ b/tests/scripts/generate_tls13_compat_tests.py
@@ -435,7 +435,7 @@
 # Purpose
 #
 # List TLS1.3 compat test cases. They are generated by
-# `{cmd}`.
+# `generate_tls13_compat_tests.py {parameter} -o {filename}`.
 #
 # PLEASE DO NOT EDIT THIS FILE. IF NEEDED, PLEASE MODIFY `generate_tls13_compat_tests.py`
 # AND REGENERATE THIS FILE.
@@ -518,7 +518,7 @@
         if args.output:
             with open(args.output, 'w', encoding="utf-8") as f:
                 f.write(SSL_OUTPUT_HEADER.format(
-                    filename=os.path.basename(args.output), cmd=' '.join(sys.argv)))
+                    filename=os.path.basename(args.output), parameter='-a'))
                 f.write('\n\n'.join(get_all_test_cases()))
                 f.write('\n')
         else:
@@ -529,11 +529,11 @@
         if args.output:
             with open(args.output, 'w', encoding="utf-8") as f:
                 f.write(SSL_OUTPUT_HEADER.format(
-                    filename=os.path.basename(args.output)))
+                    filename=os.path.basename(args.output), parameter='-r'))
                 f.write('\n\n'.join(get_hrr_test_cases()))
                 f.write('\n')
         else:
-            print('\n'.join(get_hrr_test_cases()))
+            print('\n\n'.join(get_hrr_test_cases()))
         return 0
 
     if args.list_ciphers or args.list_sig_algs or args.list_named_groups \