Update capibmadm cli tool installation guide

[shwetha-s-poojary]

What this PR does / why we need it:

• formatted capibmadm installation instructions.
• Modified release checklist to include a section about updating the capibmadm tool version after every new release.

Which issue(s) this PR fixes:

Fixes #2367

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

updated capibmadm cli tool installation guide

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @shwetha-s-poojary. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mkumatag]

tabs are not getting listed in the published doc here - https://deploy-preview-2470.cluster-api-ibmcloud.sigs.k8s.io/

[Amulyam24]

/ok-to-test

[Amulyam24]

/retest

[mkumatag]

minor comment, otherwise LGTM

[mkumatag]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mkumatag, shwetha-s-poojary

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