PR Summary

• Fix wrong variable names in examples.
• Remove Write-Host from the correct example. It is duplicated with outputs of -WhatIf or -Confirm. It also violates "Avoid Using Write-Host" rule.
• Correct the severity of ShouldProcess rule as mentioned in ShouldProcess.md. Get-ScriptAnalyzerRule -Name PSShouldProcess | % Severity also returns "Warning" with ScriptAnalyzer 1.20.0

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.
• Update examples can run successfully on PowerShell 7.2.1.
• Script Analyzer 1.20.0 detects a ShouldProcess violation in the updated wrong example. For some reason, Script Analyzer 1.20.0 doesn't detect any ShouldProcess violation in the updated wrong example.
• Script Analyzer 1.20.0 detects no error in the updated correct example.