Update access review multi-stage guidelines in documentation

[leherpel]

Clarified the implications of reviewer settings in multi-stage access reviews and added details on handling denied guest users.

[prmerger-automator]

@leherpel : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[v-dirichards]

Hi @leherpel - This pull request was opened in the public repo. Microsoft contributors should work in the private repo, per the Microsoft Docs contributor guide. We can keep this PR open for review and merge, but would you make future content updates in the private repo? Thank you!

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@OWinfreyATL

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[Copilot]

Pull request overview

Updates the “Create an access review” documentation to better explain how reviewer settings behave in multi-stage access reviews, helping admins understand when default actions are applied and how decisions roll up across stages.

Changes:

• Added a NOTE clarifying how the If reviewers don't respond setting is applied in multi-stage access reviews.
• Explained how child-stage decisions carry forward to the parent review instance and how to carry recommendations forward.

[leherpel]

@v-dirichards Got it thanks for the heads up, I did not realize that. Will make changes on the private repo going forward.