docs: Improvements to release doc

[ahmetb]

/assign corneliusweig

[codecov-io]

Codecov Report

Merging #415 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #415   +/-   ##
=======================================
  Coverage   56.41%   56.41%           
=======================================
  Files          19       19           
  Lines         927      927           
=======================================
  Hits          523      523           
  Misses        349      349           
  Partials       55       55

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[corneliusweig]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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