Fix copying declaration

kanagawa-theme.el

@@ -10,26 +10,20 @@
 ;; Created: 16 September 2023
 ;; Keywords: themes faces
 
-;; The MIT License (MIT)
-
-;; Permission is hereby granted, free of charge, to any person obtaining
-;; a copy of this software and associated documentation files (the
-;; "Software"), to deal in the Software without restriction, including
-;; without limitation the rights to use, copy, modify, merge, publish,
-;; distribute, sublicense, and/or sell copies of the Software, and to
-;; permit persons to whom the Software is furnished to do so, subject to
-;; the following conditions:
-
-;; The above copyright notice and this permission notice shall be
-;; included in all copies or substantial portions of the Software.
-
-;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+;; This file is not part of GNU Emacs.
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary: