Need to clarify RegistryKey.FromHandle will always set the KeyName to empty string

[gewarren]

From @tarekgh on Tuesday, May 12, 2020 4:32:55 PM

Issue description

When creating RegisteryKey from a handle using RegistryKey.FromHandle, the key name is always set to empty string. The documentation need to explicitly mention that.

This issue reported on the community portal.

Target framework

Check the .NET target framework(s) being used, and include the version number(s).

• [ x] .NET Core
• [ x] .NET Framework
• [ x] .NET Standard

Copied from original issue: dotnet/docs#18370