[All hosts] (dialog) Update Dialog API articles

[samantharamon]

• Adds a note about the window.name property in Outlook on the web and new Outlook on Windows.
• Replaces "gotcha" to align with the style guide.
• Adds behaviors/limitations from the Remarks section of the displayDialogAsync method.
• Applies minor formatting fixes for consistency.

[learn-build-service-prod]

Learn Build status updates of commit db8ebbf:

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docs/develop/dialog-best-practices.md	✅Succeeded	View

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[Rick-Kirkham]

Approving with one style guide suggestion.

[learn-build-service-prod]

Learn Build status updates of commit 9400bac:

✅ Validation status: passed

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docs/develop/dialog-best-practices.md	✅Succeeded	View

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[learn-build-service-prod]

Learn Build status updates of commit 947cbf7:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/dialog-api-in-office-add-ins.md	✅Succeeded	View
docs/develop/dialog-best-practices.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel