Update tutorial-postgresql-azure-postgresql-online.md

This command has been changed. Below is the list of new parameters -
Command
    az dms project task cutover : For an online migration task, complete the migration by performing
    a cutover.
        To see the result of the request, please use the 'task show' command:
            az dms project task show ... --expand command.

Arguments
    --name -n           [Required] : The name of the Task. DMS Task is the activity that performs a
                                     migration related task. There could be multiple Tasks
                                     associated to a Project.
    --project-name      [Required] : The name of the Project. DMS Project is a logical grouping that
                                     encompasses source database connection, target database
                                     connection and a list of databases to migrate.
    --resource-group -g [Required] : Name of resource group. You can configure the default group
                                     using `az configure --defaults group=<name>`.
    --service-name      [Required] : The name of the Service. DMS Service is an Azure instance that
                                     performs database migrations.
    --immediate                    : For MongoDB migrations, whether to cutover immediately or to
                                     let the currently loaded events get migrated. For all other
                                     migration types, this has no effect.
    --object-name                  : For MongoDB migrations, the qualified name of the database or
                                     collection you wish to cutover. Leave blank to cutover the
                                     entire migration. For all other migration types, the name of
                                     the database on the source you wish to cutover.

Author: neetusingh-ms

articles/dms/tutorial-postgresql-azure-postgresql-online.md

@@ -470,7 +470,7 @@ To ensure all data is caught up, validate row counts between the source and targ
     For example:
 
     ```
-    az dms project task cutover --service-name PostgresCLI --project-name PGMigration --resource-group PostgresDemo --name Runnowtask  --database-name Inventory
+    az dms project task cutover --service-name PostgresCLI --project-name PGMigration --resource-group PostgresDemo --name Runnowtask  --object-name Inventory
     ```
 
 2. To monitor the cutover progress, run the following command: