Update README.md

Author: sashaphmn

README.md

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 ## Internet-scale Neural Networks <!-- omit in toc -->
 
-[Discord](https://discord.gg/qasY3HA9F9) • [Network](https://taostats.io/) • [Research](https://bittensor.com/whitepaper)
+[Documentation](https://docs.bittensor.com) • [Network](https://taostats.io/) • [Research](https://bittensor.com/whitepaper)
 
 </div>