Fix Helm chart deprecation notice in dashboard 1.84.0 blog

[petersutter]

/kind cleanup

What this PR does / why we need it:

Corrects the Helm Chart Deprecation Notice section to distinguish between the two deprecation cases:

• gardener-dashboard chart: deprecated in favor of gardener-operator (chore(charts): deprecate helm charts in favor of gardener-operator dashboard#2935)
• identity chart: deprecated without replacement (docs(charts): correct identity chart deprecation notice dashboard#2963)

Which issue(s) this PR fixes:

Follow-up to #963

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[gardener-prow]

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[petersutter]

/invite @grolu

[n-boshnakov]

/lgtm

Waiting on @grolu's review, I will merge afterwards. Ping me if you want me to merge the PR right away.

[gardener-prow]

LGTM label has been added.

Details

Git tree hash: 7093189810a7314c450e5c3fb33ee901eb5cbe06