scripts: kernel-doc: Refresh the copyright lines

I wanted to clean up these lines, but in the end decided not to touch
the old ones and just add my own about POD. I'll leave the cleanup
for lawyers.
Signed-off-by: NTomasz Warniełło <tomasz.warniello@gmail.com>
Tested-by: NRandy Dunlap <rdunlap@infradead.org>
Acked-by: NRandy Dunlap <rdunlap@infradead.org>
Disliked-by: NAkira Yokosawa <akiyks@gmail.com>
Link: https://lore.kernel.org/r/20220218181628.1411551-12-tomasz.warniello@gmail.comSigned-off-by: NJonathan Corbet <corbet@lwn.net>

scripts/kernel-doc

@@ -12,6 +12,8 @@ use strict;
 ## 								 ##
 ## #define enhancements by Armin Kuster <akuster@mvista.com>	 ##
 ## Copyright (c) 2000 MontaVista Software, Inc.			 ##
+#
+# Copyright (C) 2022 Tomasz Warniełło (POD)
 
 use Pod::Usage qw/pod2usage/;