cloud-setup: add code comment to nmcs_utils_hwaddr_normalize()

clients/cloud-setup/nm-cloud-setup-utils.c

@@ -501,6 +501,8 @@ nmcs_utils_hwaddr_normalize (const char *hwaddr, gssize len)
 		nm_assert (hwaddr);
 		hwaddr = nm_strndup_a (300, hwaddr, len, &hwaddr_clone);
 	}
+	/* we cannot use _nm_utils_hwaddr_aton() because that requires a delimiter.
+	 * Azure exposes MAC addresses without delimiter, so accept that too. */
 	if (!nm_utils_hexstr2bin_full (hwaddr, FALSE, FALSE, FALSE, ":-", sizeof (buf), buf, sizeof (buf), NULL))
 		return NULL;