📖 Remove unnecessary task from release tasks doc

[g-gaston]

What this PR does / why we need it:
This seems to not be needed anymore now we have automated the release note generation.

/area release

[furkatgofurov7]

/lgtm

@g-gaston probably it would help to link #8817 in the PR description for someone reviewing it and not tracking release notes automation work.

/cc @kubernetes-sigs/cluster-api-release-team

[k8s-ci-robot]

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In response to this:

/lgtm

@g-gaston probably it would help to link #8817 in the PR description for someone reviewing it and not tracking release notes automation work.

/cc @kubernetes-sigs/cluster-api-release-team

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 39ee4f3e70619539b4bc323c2e3aee634d0f6a47

[killianmuldoon]

/lgtm

Thanks!

[killianmuldoon]

/approve

[k8s-ci-robot]

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