APPS and TEST: Make sure prog name is set for usage output

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14841)
diff --git a/test/testutil.h b/test/testutil.h
index 8457a2a..9311e2c 100644
--- a/test/testutil.h
+++ b/test/testutil.h
@@ -174,9 +174,9 @@
  * the test system.
  *
  * Tests that need to use opt_next() need to specify
- *  (1) test_get_options() containing an options[] (Which should include either
- *    OPT_TEST_OPTIONS_DEFAULT_USAGE OR
- *    OPT_TEST_OPTIONS_WITH_EXTRA_USAGE).
+ *  (1) test_get_options() containing an options[] which should include either
+ *    OPT_TEST_OPTIONS_DEFAULT_USAGE or
+ *    OPT_TEST_OPTIONS_WITH_EXTRA_USAGE(...).
  *  (2) An enum outside the test_get_options() which contains OPT_TEST_ENUM, as
  *      well as the additional options that need to be handled.
  *  (3) case OPT_TEST_CASES: break; inside the opt_next() handling code.
@@ -232,7 +232,7 @@
  * Used to supply test specific command line options,
  * If non optional parameters are used, then the first entry in the OPTIONS[]
  * should contain:
- * { OPT_HELP_STR, 1, '-', "list of non optional commandline params\n"},
+ * { OPT_HELP_STR, 1, '-', "<list of non-optional commandline params>\n"},
  * The last entry should always be { NULL }.
  *
  * Run the test locally using './test/test_name -help' to check the usage.