tests: add link to interesting resource about {0} initialization

tests/test_core_platform.c

@@ -64,6 +64,8 @@ const char* test_platform__global_h()
 const char* test_platform__compiler()
 {
     /* Check that initialization with {0} works as expected
+     *
+     * See http://www.ex-parrot.com/~chris/random/initialise.html
      *
      * Depending on your version, GCC can incorrectly reports the warning
      * "missing braces around initializer [-Wmissing-braces]"