Fix index pages content in book

[Prajyot-Parab]

/kind documentation
/area provider/ibmcloud

Describe the solution you'd like
Fix index page content in book

• https://cluster-api-ibmcloud.sigs.k8s.io/topics/vpc/
• https://cluster-api-ibmcloud.sigs.k8s.io/developer/
• https://cluster-api-ibmcloud.sigs.k8s.io/reference/reference

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

[Prajyot-Parab]

/good-first-issue

[k8s-ci-robot]

@Prajyot-Parab:
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[Niharika0306]

/assign

[kishen-v]

Raised #1508, a single PR with the changes for indexes alongside other documentation changes.

[kishen-v]

/assign

[k8s-ci-robot]

@kishen-v: You can't close an active issue/PR unless you authored it or you are a collaborator.

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/close

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[Amulyam24]

/close

[k8s-ci-robot]

@Amulyam24: Closing this issue.

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/close

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