[Outlook] (event-based activation) Document the OnAttachmentAction event

[samantharamon]

Related PR: OfficeDev/office-js-docs-pr#5775

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

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[learn-build-service-prod]

Learn Build status updates of commit 5d5a928:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/requirement-sets/outlook/outlook-requirement-set-preview.md	💡Suggestion	View (>=common-js || >=outlook-js-1.1 || >=excel-js-1.1 || onenote-js-1.1 || >=powerpoint-js-1.1 || visio-js-1.1 || >=word-js-1.1)	Details

docs/requirement-sets/outlook/outlook-requirement-set-preview.md

• Line 32, Column 136: [Suggestion: learn-site-link-broken - See documentation] Link '/office/dev/add-ins/outlook/on-attachment-action-event' points to a learn site page that doesn't exist. Check the path or URL and update the link.

For more details, please refer to the build report.

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