amount.h: update license, add header end comment + rem from util.h

src/amount.h

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_AMOUNT_H
@@ -10,4 +10,4 @@
 
 typedef int64_t CAmount;
 
-#endif
+#endif //  BITCOIN_AMOUNT_H