[Excel] (Custom functions) Add new cache clear guidance

[alison-mk]

No description provided.

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[Copilot]

Pull Request Overview

This PR updates the Excel custom functions troubleshooting documentation by adding new guidance on clearing the custom functions cache.

• Updated the document's metadata date.
• Added a new section with a code sample to programmatically clear the custom functions cache.

[learn-build-service-prod]

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[davidchesnut]

I'm just a bit confused on how the function works.

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[Copilot]

Pull Request Overview

This PR adds new guidance for clearing the cache for Excel custom functions, updating the documentation to help developers ensure that cache-related changes are correctly applied. Key changes include:

• Updating the ms.date metadata.
• Adding a new section that explains how and when to clear the custom functions cache using sample JavaScript methods.
• Providing both enabling (setForceRefreshOn) and disabling (setForceRefreshOff) code examples.

[learn-build-service-prod]

Learn Build status updates of commit b8c1d04:

✅ Validation status: passed

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