Update tutorial-migration-service-rds-online.md

[brandonpires]

Changed the migration-mode options for a CLI to "online" since this document is for an online migration

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[v-dirichards]

@apduvuri

Can you review the proposed changes?

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[Copilot]

Pull request overview

This PR corrects a documentation error in the Azure Database for PostgreSQL migration service tutorial. The document specifically covers online migration from Amazon RDS to Azure, but the CLI example incorrectly used --migration-mode offline. This fix ensures the command example aligns with the tutorial's purpose and the guidance on line 75 that instructs users to change the migration mode to "Online".

Key Changes

• Fixed migration-mode parameter in CLI command from "offline" to "online"