tree-wide: drop empty comments

src/shared/dns-domain.c

@@ -1,6 +1,4 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
-/***
- ***/
 
 #if HAVE_LIBIDN2
 #  include <idn2.h>

src/shared/dns-domain.h

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
-/***
- ***/
 
 #include <errno.h>
 #include <stdbool.h>