[Excel] (Custom functions) Document unified manifest support

[alison-mk]

This PR documents how to use the unified manifest for Microsoft 365 with custom functions add-ins.

[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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[learn-build-service-prod]

Learn Build status updates of commit cea6ff7:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/configure-your-add-in-to-use-a-shared-runtime.md	✅Succeeded	View
docs/develop/convert-xml-to-json-manifest.md	✅Succeeded	View
docs/excel/custom-functions-json.md	✅Succeeded	View
docs/excel/custom-functions-naming.md	✅Succeeded	View
docs/excel/custom-functions-overview.md	✅Succeeded	View
docs/excel/custom-functions-troubleshooting.md	✅Succeeded	View
docs/excel/custom-functions-unified-manifest.md	✅Succeeded	View
docs/includes/excel-custom-functions-note.md	✅Succeeded	n/a (file deleted or renamed)
docs/quickstarts/excel-custom-functions-quickstart.md	✅Succeeded	View
docs/quickstarts/excel-quickstart-react.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View
docs/tutorials/excel-tutorial-create-custom-functions.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 1b47380:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/configure-your-add-in-to-use-a-shared-runtime.md	✅Succeeded	View
docs/develop/convert-xml-to-json-manifest.md	✅Succeeded	View
docs/excel/custom-functions-json.md	✅Succeeded	View
docs/excel/custom-functions-naming.md	✅Succeeded	View
docs/excel/custom-functions-overview.md	✅Succeeded	View
docs/excel/custom-functions-troubleshooting.md	✅Succeeded	View
docs/excel/custom-functions-unified-manifest.md	✅Succeeded	View
docs/includes/excel-custom-functions-note.md	✅Succeeded	n/a (file deleted or renamed)
docs/quickstarts/excel-custom-functions-quickstart.md	✅Succeeded	View
docs/quickstarts/excel-quickstart-react.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View
docs/tutorials/excel-tutorial-create-custom-functions.md	✅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

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[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

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit bf2dd40:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/configure-your-add-in-to-use-a-shared-runtime.md	✅Succeeded	View
docs/develop/convert-xml-to-json-manifest.md	✅Succeeded	View
docs/excel/custom-functions-json.md	✅Succeeded	View
docs/excel/custom-functions-naming.md	✅Succeeded	View
docs/excel/custom-functions-overview.md	✅Succeeded	View
docs/excel/custom-functions-troubleshooting.md	✅Succeeded	View
docs/excel/custom-functions-unified-manifest.md	✅Succeeded	View
docs/includes/excel-custom-functions-note.md	✅Succeeded	n/a (file deleted or renamed)
docs/quickstarts/excel-custom-functions-quickstart.md	✅Succeeded	View
docs/quickstarts/excel-quickstart-react.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View
docs/tutorials/excel-tutorial-create-custom-functions.md	✅Succeeded	View

For more details, please refer to the build report.