Misreference to Older Version of gRPC for Node

[atarikaltunn]

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Issue description
There is a misreference for API reference, the tab is referring to older version of gRPC Node.

Steps to reproduce the issue

1. Go to grpc.io
2. Click on Docs
3. Find the Node.JS part of the doc
4. Click to API Reference
5. You came to document for deprecated version of grpc

Expected behavior
It should refer to newer version of documentation.