[ogorzalka]

Fixes two statements of the WP-CLI page, checked against WP-CLI's CommandFactory and pollora/wp-cli:

• Subcommand names: WP-CLI registers a public method under its name as written (listUsers), not in kebab case. Only #[Command] with no argument derives list-users. The example and the slug table now say so.
• Service injection: the example only works from pollora/wp-cli 0.1.1 (Pollora 13.36), where WP-CLI receives the command instance built with its dependencies. Before it, WP-CLI built the class with new $class() (Pollora/wp-cli#1).

To merge with the v13.36 release, like #48.