The page seems to have moved to here: https://developer.apple.com/help/account/reference/provisioning-with-managed-capabilities
It says:
Provisioning with capabilities
Managed capabilities can now be enabled directly in Xcode 15 or later. These capabilities may have one or more entitlements and are now available in the Signing & Capabilities tab in Xcode. Once enabled, new provisioning profiles for that App ID will automatically include the associated entitlements.
Keep in mind that:
This new workflow supports automatic signing and Xcode Cloud workflows by default for features such as CarPlay and multicast networking.
…
During your next continuous integration test, Xcode Cloud will see the latest configuration of your App ID and include enabled additional capabilities in the provisioning profile automatically. This enables automatic signing for features like CarPlay and Multicast Networking.