chore(tests): update note message in framework test

t/framework.c

@@ -1,11 +1,11 @@
-/*
- * NOTE:
- * Only this test has memory leak cause of log, conf, and multiprocess-related stuffs
- */
+#include <stdio.h>
 #include "mln_framework.h"
 
 int main(int argc, char *argv[])
 {
+    printf("NOTE: This test has memory leak because we don't release memory of log, conf and multiprocess-related stuffs.\n");
+    printf("In fact, `mln_framework_init` should be the last function called in `main`, so we don't need to release anything.\n");
+
     struct mln_framework_attr cattr;
     cattr.argc = argc;
     cattr.argv = argv;