Docs needed: Azure Connector Namespace integration referenced in 13.6 what's new #1781

The What's new in Aspire 13.6 page introduces the preview Aspire.Hosting.Azure.ConnectorNamespace integration, but there is no docs page for it yet. The LearnMore in the what's-new draft previously pointed at the package README in microsoft/aspire, which we don't want to ship as a customer-facing link.

In the 13.6 what's-new source (src/frontend/src/content/docs/whats-new/aspire-13-6.mdx), the LearnMore for this integration is now disabled (commented out) with a TODO pointing at this issue. Once a docs page exists, re-enable and link it from the "Azure Connector Namespace" subsection.

Feature summary: model connections to external services and expose selected operations through managed MCP server configurations, with explicit operation allow-lists and Microsoft Entra access policies configured in the AppHost. Requires preview access in the Azure subscription/region.