Fuller PHPdoc coverage for `WP_CLI\Dispatcher\Subcommand`
Document `WP_CLI\Dispatcher\get_path()`
PHPdoc and explicit method definitions for `WP_CLI\Dispatcher\RootCommand`
PHPdoc coverage for `\WP_CLI\Dispatcher\CompositeCommand`
PHPdoc for `\WP_CLI\Dispatcher\CommandFactory`
More PHPdoc for `\WP_CLI\Runner`
`WP_CLI` and `WP_CLI\Configurator` also got some PHPdoc coverage
Merge pull request #1152 from wp-cli/internal-docs

PHPdoc coverage for `\WP_CLI\Dispatcher` and friends