[docs][yugabyted][2024.1.2] Add Read Replica and xCluster examples

[gargsans-yb]

Summary:

• Adding xcluster command and it's respective sub-commands.
• Adding examples for read-replica deployments
• Adding examples for setting-up xcluster replication.
• Adding examples on how to use CSV value master and tserver gflags.
• Updating example on Upgrading a YugabyteDB cluster to a newer version using finalize_upgrade command.

DOC-414 DOC-386

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