Document the IsImplicitlyDefined metadata on PackageReference items, that MSBuild SDKs are expected to set to any PackageReference the SDK itself defines, so that Visual Studio's PackageManager doesn't try to offer it as an upgradable package that will fail if the upgrade is attempted. It also makes the PackageReference work for projects using CPM.
Document the
IsImplicitlyDefinedmetadata onPackageReferenceitems, that MSBuild SDKs are expected to set to any PackageReference the SDK itself defines, so that Visual Studio's PackageManager doesn't try to offer it as an upgradable package that will fail if the upgrade is attempted. It also makes the PackageReference work for projects using CPM.