Improve the docs

[aurmil]

hello

I did not see anywhere that you have to use % delimiter in config values to specify a placeholder

and the example code is wrong

$configurationBuilder = new YamlFileConfigurationBuilder('config/config.yml');

it should be

$configurationBuilder = new YamlFileConfigurationBuilder(['config/config.yml']);

as the class construct method wants an array

public function __construct(array $yamlConfigurationFilenames)

regards