ethosdev

ethereum.org updates can be seen here: https://github.com/ethereum/ethereum-org-website/commits/dev/src/content/developers/docs/evm/opcodes/index.md An alternative to this PR is to make the same updates in this repo, but it doesn't appear to be a sustainable alternative?

Use plural Specifications. This matches the repo name which is plural distributed-validator-specs (as well as other repo README such as the consensus-specs).