Nokia RX-51: Update my email address

I'm using a new email address, so reflect this state also in U-Boot.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/doc/README.bootmenu b/doc/README.bootmenu
index ca50990..9ff89f2 100644
--- a/doc/README.bootmenu
+++ b/doc/README.bootmenu
@@ -1,6 +1,6 @@
 SPDX-License-Identifier: GPL-2.0+
 /*
- * (C) Copyright 2011-2012 Pali Rohár <pali.rohar@gmail.com>
+ * (C) Copyright 2011-2012 Pali Rohár <pali@kernel.org>
  */
 
 ANSI terminal bootmenu command