Merge pull request #8987 from JanKrivanek/patch-2

Mention Private metadata for ProjectReference

Author: ghogen

docs/msbuild/common-msbuild-project-items.md

@@ -81,6 +81,7 @@ Represents a reference to another project. `ProjectReference` items are transfor
 |Project|Optional string. A GUID for the reference, in the form {12345678-1234-1234-1234-123456781234}.|
 |OutputItemType|Optional string. Item type to emit target outputs into. Default is blank. If the Reference metadata is set to "true" (default) then target outputs will become references for the compiler.|
 |ReferenceOutputAssembly|Optional boolean. If set to `false`, does not include the output of the referenced project as a [Reference](#reference) of this project, but still ensures that the other project builds before this one. Defaults to `true`.|
+|Private|Optional boolean. Specifies whether the reference should be copied to the output folder. This attribute matches the **Copy Local** property of the reference that's in the Visual Studio IDE.|
 |SetConfiguration|Optional string. Sets the global property `Configuration` for the referenced project, for example `Configuration=Release`.|
 |SetPlatform|Optional string. Sets the global property `Platform` for the referenced project, for example `Platform=AnyCPU`.|
 |SetTargetFramework|Optional string. Sets the global property `TargetFramework` for the referenced project, for example `TargetFramework=netstandard2.0`.|