Misreference to Older Version of gRPC for Node

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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](https://grpc.io)
2. Click on [Docs](https://grpc.io/docs/)
3. Find the [Node.JS part of the doc](https://grpc.io/docs/languages/node/)
4. Click to [API Reference](https://grpc.github.io/grpc/node/)
5. You came to document for deprecated version of grpc

**Expected behavior**
It should refer to newer version of documentation.