code: public static Iterable<ConfigurationPropertySource> from(PropertySource<?> source) {
  		return Collections.singleton(SpringConfigurationPropertySource.from(source));
  	}
docs: Return {@link Iterable} containing a single new {@link ConfigurationPropertySource}
  adapted from the given Spring {@link PropertySource}.
  @param source the Spring property source to adapt
  @return an {@link Iterable} containing a single newly adapted
  {@link SpringConfigurationPropertySource}