Error message nitpicking

[Shriramana Sharma via Digitalmars-d]

object.d (from dmd 2.068.2) line 1636: 

auto e = new Exception("msg", new Exception("It's an Excepton!"), "hello", 
42);

Next time somebody edits this file, s/Excepton/Exception. 

Didn't want to file a bug for such a minor issue.