Update release data in documentation

[Amulyam24]

Recently, an issue template has been added with a checklist of items that have to be updated after each release.
https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/blob/main/.github/ISSUE_TEMPLATE/release.md

It would be good to have the information in the official documentation as well.

[Amulyam24]

/good-first-issue

[k8s-ci-robot]

@Amulyam24:
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[sayantani11]

/assign

[anshuman-agarwala]

Hi @sayantani11 are you still willing to handle this issue? If not, please consider unassigning it.