all: move description of C files below the copyright and license

src/plugins/plugin-script-api.c

@@ -1,6 +1,4 @@
 /*
- * script-api.c - script API functions, used by script plugins
- *
  * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
@@ -22,6 +20,8 @@
  * along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+/* Script API functions, used by script plugins */
+
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>