added specific details to RELEASE.md

[longwuyuan]

What this PR does / why we need it:

Imroves documentation of RELEASE.md

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

fixes #7495
-->

How Has This Been Tested?

Observed during release

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[longwuyuan]

fixes: #7495

[longwuyuan]

/area docs

[iamNoah1]

For the base image section, I think you forgot the part, where we have to update the references to the promoted image. see this: https://github.com/kubernetes/ingress-nginx/pull/7473/files

[k8s-ci-robot]

@longwuyuan: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[tao12345666333]

This is not needed

[longwuyuan]

Because old dev-v1 merged to main for releasing v1.0.0, my fork is way way way out of sync and I am not going to rebase it all. So I deleted my fork, hence I will close this PR. I will use backup of the lone file involved and create a new PR.