[all] (Community Call) Update info with current call data

[AlexJerabek]

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[learn-build-service-prod]

Learn Build status updates of commit 2f68343:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/overview/office-add-ins-community-call.md	✅Succeeded	View

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[learn-build-service-prod]

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[Copilot]

Pull request overview

Updates the Office Add-ins community call overview page to reflect the current (July 8, 2026) community call information.

Changes:

• Updated ms.date to 07/08/2026.
• Updated the agenda section title to the July 8, 2026 call.
• Replaced the placeholder agenda text with the actual agenda items/speakers.

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