Improve documentation about writing release notes

[timonrey]

closes https://github.com/commercetools/commercetools-docs/issues/5189

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Latest commit: 03c86fde8994999a6fe81ef055956e041b21b243

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See details

`websites/docs-smoke-test/src/releases/release-format-definition.mdx` Knowledge based on git-blame: `websites/documentation/src/content/writing/release-notes.mdx` Knowledge based on git-blame:

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