Update /developers/docs/nodes-and-clients/node-architecture/

[mansurmasama]

There are essentially two types of clients: execution and consensus. A separate “validator client” doesn’t exist. If a node wants to perform validation, it simply needs to run both the execution and consensus clients—there’s no need to set up an additional validator client.

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[wackerow]

Thanks @mansurmasama, would push back on this though. Despite these being bundled, the validator client is commonly an optional separate process from just the beacon node:

• https://prysm.offchainlabs.com/docs/backup-and-migration/database-backups/#validator-client
• https://nimbus.guide/validator-client.html (optional to run with beacon node, or can run separately)
• https://lighthouse-book.sigmaprime.io/help_vc.html
• https://chainsafe.github.io/lodestar/run/validator-management/vc-configuration
• https://docs.teku.consensys.io/get-started/start-teku#start-the-validator (optional to run with beacon node, or can run separately)

Grandine (https://docs.grandine.io/validator_client.html) does appears to have this baked in as the only option, enabled by just passing signing keys, though it's the only client I don't have personal experience with.

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Going to close out, but if you'd like can re-open and offer a suggestion to adjust the copy so this is more clear. Thanks!