Dependency Script docs should clarify how to run with -Debug or -Verbose

[chrisglein]

We should add clarification to the docs on this:

The script suggest running with flags -debug or -verbose, but it's unclear how to do that when the command is: iex (New-Object System.Net.WebClient).DownloadString('https://aka.ms/rnw-vs2022-deps.ps1'); Attempting to do iex (New-Object System.Net.WebClient).DownloadString('https://aka.ms/rnw-vs2022-deps.ps1 -verbose'); did not work.

Originally posted by @chrisglein in #13882