Add docs for kibana-setup CLI

[jportner]

In #120836, we added docs for the kibana-verification-code CLI.

We should also add docs for the related kibana-setup CLI:

kibana/src/cli_setup/cli_setup.ts

Lines 29 to 37 in 7d081a9

	const program = new Command('bin/kibana-setup');
	program
	.version(kibanaPackageJson.version)
	.description(
	'This command walks you through all required steps to securely connect Kibana with Elasticsearch'
	)
	.option('-t, --enrollment-token <token>', 'Elasticsearch enrollment token')
	.option('-s, --silent', 'Prevent all logging');

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)