Fix up the example.
Fix up the example.

tempbottle/capnp-rpc-rust,placrosse/capnp-rpc-rust,dwrensha/capnp-rpc-rust,placrosse/capnp-rpc-rust,dwrensha/capnp-rpc-rust,placrosse/capnproto-rust,tempbottle/capnproto-rust,tempbottle/capnp-rpc-rust,dwrensha/capnproto-rust