Gets the page's own output intents (OutputIntents, PDF 2.0), in the order written; empty when it has none.
public IReadOnlyList<PdfOutputIntent> OutputIntents { get; }
ISO 32000-2 §7.7.3.3, Table 31, and §14.11.5: when a page has output intents, a processor that respects output intents uses them for that page instead of the document's (OutputIntents). Not inheritable; read on every call.