Update create-a-custom-prompt.md

[dalajogun]

Adding a link to the row summary configuration doc under the subsection "Use your prompt in Power Apps or Power Automate"

[learn-build-service-prod]

Learn Build status updates of commit e8ca922:

💡 Validation status: suggestions

File	Status	Preview URL	Details
ai-builder-docs/create-a-custom-prompt.md	💡Suggestion		Details

ai-builder-docs/create-a-custom-prompt.md

• Line 124, Column 5: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://review.learn.microsoft.com/en-us/power-apps/maker/data-platform/configure-form-row-summary?branch=matp-443302' will be broken in isolated environments. Replace with a relative link.

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