Fix typo in Changelog, date in version.cc.

Review URL: http://codereview.chromium.org/6287016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6535 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

-2011-01=31: Version 3.1.0
+2011-01-31: Version 3.1.0
+
         Performance improvements on all platforms.
 
 

src/version.cc

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met: