Config limitation: names can't be changed after the cluster is bootstrapped

[p7nov]

Product: Tarantool
Since: 3.0
Root document:

• https://www.tarantool.io/en/doc/latest/platform/configuration/
• https://www.tarantool.io/en/doc/latest/reference/configuration/configuration_reference/
  SME: @ Totktonada

Details

Request from delivery: add info that the names of cluster elements – groups, replica sets, instances – can't be changed after the cluster has started.
TODO: find out the exact moment after which these names cant' be changed.