Sync changes from docs repo

[sdwheeler]

PR Summary

Copies the changes from PR MicrosoftDocs/PowerShell-Docs-Modules#74 that fixes issue MicrosoftDocs/PowerShell-Docs-Modules#17.

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.

[sdwheeler]

@bergmeister For your review

[bergmeister]

Looks good to me. It's good we finally put the limitation around scriptblock scope into docs. I'm not sure folks will still understand it though what it means in terms of expected false positives. But this should not block this PR, I think I will take a note to add a couple of known false positives in another PR as it's a frequent source of opened issues (as well as user frustration)