These are unofficial (whatever official means in Ethereum...) documents/diagrams for others to understand the spec better
The ETH 2.0 spec can be found here: github.com/ethereum/eth2.0-specs
External text resources:
- Eth 2.0 Design Rationale (main author: Vitalik Buterin)
- Eth 2.0 Accompanying spec resource. Added soon (main author: Danny Ryan)
- The ol' trusty Eth 2.0 Handbook
Diagrams: