Add a document for topology provisioning for internal mode

[parth-gr]

Is this a bug report or feature request?

• Feature Request

User can use topology provisioning in internal mode too, but there no documentations and examples in the storageclass
So this feature request to add them,
Similar to https://github.com/rook/rook/blob/master/Documentation/CRDs/Cluster/external-cluster/topology-for-external-mode.md

What should the feature do:

What is use case behind this feature:

Environment: