Fix doctest broken by the NetworkLinkControl ordering fix
docs/Document-clean.kml has NetworkLinkControl before Document, matching
the OGC conformance fixture this doc guide is based on. Now that KML.parse()
correctly preserves that order (see the NetworkLinkControl fix), features[0]
is NetworkLinkControl, not Document -- update the doctest to show the whole
features list instead of assuming Document is first.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
