permissions: very minor spelling changes

modules/permissions/README

@@ -18,9 +18,9 @@ Edited by
 
 Emmanuel Schmidbauer
 
-   Copyright � 2003 Miklos Tirpak
+   Copyright © 2003 Miklos Tirpak
 
-   Copyright � 2006-2008 Juha Heinanen
+   Copyright © 2006-2008 Juha Heinanen
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