Suggestions for modifying the MCI part of the official document

[XMingG99]

In the official website document, an experiment on MCI is given. Before deploying MCI, a MCS is deployed. This step is unnecessary.
In order to better reflect the characteristics of MCI, here are two suggestions for MCI experiment:

1. Deploy different services in different member clusters, and then deploy a MCI in the control plane to connect these services, which can reflect the 'MCI is a cluster-level Ingress' feature
   

2. Deploy the same service in different member clusters, and then deploy an MCI in the control plane to connect all services with the same name.
   

However, Scheme 2 has a defect that is how to synchronize the data between the services with the same name in different clusters. This is still to be discussed. The above experiments have not been implemented. We welcome scholars to participate in the discussion, put forward critical suggestions or contribute to the experimental results.