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_generate.cpp

@@ -24,4 +24,4 @@ namespace hash
         k.k1 = gen();
         return k;
     }
-}
+}