Add a documentation section in the using guide about setting empty values in PowerShell using --someStringOption=""

[martinlingstuyl]

As we've seen in the mentioned issue below, there is an issue in PowerShell when setting options to empty values.
The problem is that PowerShell does not pass an empty string argument to the CLI, which results in the option being evaluated as a flag.

--description "" would result in description: true.

The workaround

Using --description="" takes care of passing the empty string arg correctly to the CLI.

This issue is fixed when the documentation is expanded with a section explaining how to do this. Just like this section

Originally posted by @martinlingstuyl in #3718 (comment)

[SmitaNachan]

Can I work on it?

[milanholemans]

Certainly @SmitaNachan! Thanks!