[Known issues] [Project] merge to live

[lindalu-MSFT]

This PR:

• reverts the known issues title back to the original H1
• removes obsolete project article

[learn-build-service-prod]

Learn Build status updates of commit d2ac0a4:

✅ Validation status: passed

File	Status	Preview URL	Details
.openpublishing.redirection.json	✅Succeeded	View
docs/images/create-office-add-in.png	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-data-new-icon.jpg	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-data-no-connection.png	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-data-not-published.png	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-data-rest-results.png	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-data-test-the-app.png	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-o-data-choose-project.png	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-o-data-creating-app.png	✅Succeeded	n/a (file deleted or renamed)
docs/images/pj15-hello-project-o-data-initial-solution-explorer.png	✅Succeeded	n/a (file deleted or renamed)
docs/project/create-a-project-add-in-that-uses-rest-with-an-on-premises-odata-service.md	✅Succeeded	n/a (file deleted or renamed)
docs/project/project-add-ins.md	✅Succeeded	View
docs/resources/resources-office-add-in-known-issues.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View

For more details, please refer to the build report.

[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.

✅ No issues found

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