Update dotnet-publish.md (#45430)

Author: baronfel

docs/core/tools/dotnet-publish.md

@@ -94,7 +94,7 @@ The following MSBuild properties change the output of `dotnet publish`.
 
 - `PublishSingleFile`
 
-  Packages the app into a platform-specific single-file executable. For more information about single-file publishing, see the [single-file bundler design document](https://github.com/dotnet/designs/blob/main/accepted/2020/single-file/design.md).
+  Packages the app into a platform-specific single-file executable. For more information about single-file publishing, see the [single-file bundler design document](https://github.com/dotnet/designs/blob/main/accepted/2020/single-file/design.md). When this property is set to `true`, the `PublishSelfContained` property is implicitly set to `true`.
 
   We recommend that you specify this option in the project file rather than on the command line.