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

src/plugins/javascript/weechat-js-api.cpp

@@ -1,6 +1,4 @@
 /*
- * weechat-js-api.cpp - javascript API functions
- *
  * SPDX-FileCopyrightText: 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
  * SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
@@ -22,6 +20,8 @@
  * along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+/* JavaScript API functions */
+
 #undef _
 
 #include <cstdlib>