Docs: Update Guardian Key/Signer Documentation #13908

Job	Run time
cosmwasm	1m 54s
Aptos	3m 2s
cli	2m 33s
algorand	7m 14s
docker	7s
ethereum	1m 7s
ethereum-upgrade	4m 25s
node	2m 46s
npm-packages	4s
prettier	12s
relayer-ethereum	1m 3s
rust-lint-and-tests (cosmwasm/Cargo.toml)	2m 9s
sdk_vaa	1m 16s
solana	5m 46s
rust-lint-and-tests (terra/Cargo.toml)	1m 35s
spellcheck	12s
rust-lint-and-tests (sdk/rust/Cargo.toml)	33s
Sui	2m 34s
terra	6m 53s
terra-2	9m 51s
wormchain	3m 54s
node-lint	24s
node-tests	26s
tilt	3m 7s
	1h 3m 7s

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