Add support and release content to CAPIBM book doc

[Prajyot-Parab]

/kind documentation
/area provider/ibmcloud

What steps did you take and what happened:
Add support and release content (#1419) to CAPIBM doc

[Prajyot-Parab]

/good-first-issue

[k8s-ci-robot]

@Prajyot-Parab:
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[Niharika0306]

/assign

[Prajyot-Parab]

@Niharika0306 The goal is to replicate same content as here a5158a0 in https://cluster-api-ibmcloud.sigs.k8s.io/developer/
under https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/tree/main/docs/book/src/developer

[Prajyot-Parab]

/close