Update continuous export to delta table section

[anshulsharmas]

Remove 'Preview' label from delta table export section.

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Learn Build status updates of commit bd16c47:

✅ Validation status: passed

File	Status	Preview URL	Details
data-explorer/kusto/management/data-export/continuous-data-export.md	✅Succeeded

For more details, please refer to the build report.

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Pull request overview

This PR updates the Azure Data Explorer continuous export documentation by removing the “Preview” label from the “Continuous export to delta table” section header.

Changes:

• Renamed the “Continuous export to delta table - Preview” heading to “Continuous export to delta table”.

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[learn-build-service-prod]

Learn Build status updates of commit 990172c:

✅ Validation status: passed

File	Status	Preview URL	Details
data-explorer/kusto/management/data-export/continuous-data-export.md	✅Succeeded

For more details, please refer to the build report.