Incorrect overuse of validator node

[adlerjohn]

The docs refer to "validator" nodes often, but should really refer to just a consensus/core node most of the time. For example,

docs/how-to-guides/light-node.md

Line 82 in c4be5c1

Start the light node with a connection to a validator node's gRPC endpoint (which

[jcstein]

@adlerjohn would you prefer to just use either "consensus" or "core" instead of both?

[adlerjohn]

Yes, also, either one of those two instead of both

[jcstein]

Closed by #1982