Clarify live migration limitation

[dann1]

Description

When using the API or the CLI

onevm migrate --live --help
## USAGE
migrate <range|vmid_list> <hostid> [<datastoreid>]
        Migrates the given running VM to another Host. If used with --live
        parameter the miration is done without downtime.

        States: RUNNING
        valid options: enforce, live, poweroff, poweroff_hard

## OPTIONS
     -e, --enforce             Enforce that the host capacity is not exceeded
     --live                    Do the action with the VM running
     --poff                    Do the migrate by poweringoff the vm
     --poff-hard               Do the migrate by poweringoff hard the vm
     -v, --verbose             Verbose mode
     -h, --help                Show this message
     -V, --version             Show version and copyright information
     --user name               User name used to connect to OpenNebula
     --password password       Password to authenticate with OpenNebula
     --endpoint endpoint       URL of OpenNebula xmlrpc frontend

one might be under the impression that migrating system datastores live is possible. However, the API has a validation

[one.vm.migrate] A migration to a different system datastore cannot be performed live.

Clarify this on the documentation.

Also I don't know why other changes appeared, probably some automatic linting happened on vscode.

Branches to which this PR applies

• master
• one-6.10
• one-6.10-maintenance

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