Add trailing newlines to siphash examples.

I'm not sure if I'll actually release this example. I don't think it does a
good job of demonstrating what I wanted.

[SVN r84249]

examples/siphash/siphash_example.cpp

@@ -35,4 +35,4 @@ int main()
 
     assert(x1.bucket(10) == x2.bucket(10));
     assert(x1.bucket(30) == x2.bucket(30));
-}
+}