Minor comment error in node_tracers

[gareth-robinson]

In node_tracers.js for RawRESTkinHTTPTracer there is the comment "This implementation posts all traces immediately and does not implement buffering". Then there is RESTkinHTTPTracer, which uses the RawRESTkinHTTPTracer with the BufferingTracer and so doesn't have the comment above

For RawZipkinQueryServiceHTTPTracer there is similarly the comment "does not implement buffering of any sort". Then there is ZipkinQueryServiceHTTPTracer which uses the RawZipkinQueryServiceHTTPTracer with the BufferingTracer. However, the comment above ZipkinQueryServiceHTTPTracer also says "does not implement buffering of any sort" - so is this last comment a mistake?