Update README.md

Co-authored-by: lightclient <14004106+lightclient@users.noreply.github.com>

README.md

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-A service that allows Ethereum PoS consensus clients to outsource block construction to third party block builders in addition to execution clients. See [ethresearch post](https://ethresear.ch/t/mev-boost-merge-ready-flashbots-architecture/11177/) for the high level architecture and **[`docs/specification.md`](https://github.com/flashbots/mev-boost/blob/main/docs/specification.md)** for the specification and implementation details.
+A service that allows Ethereum Consensus Layer (CL) clients to outsource block construction to third party block builders in addition to execution clients. See [ethresearch post](https://ethresear.ch/t/mev-boost-merge-ready-flashbots-architecture/11177/) for the high level architecture and **[`docs/specification.md`](https://github.com/flashbots/mev-boost/blob/main/docs/specification.md)** for the specification and implementation details.
 
 ![mev-boost service integration overview](https://github.com/raw/flashbots/mev-boost/main/docs/mev-boost-integration-overview.png)