docs: add reference for the manifest

[katexochen]

No description provided.

[github-actions]

Do the documentation changes need to be backported?

Changes to /docs/docs won't be visible until the next release.
If you are fixing something in the docs that should be immediately visible, the changes needs to be made to both /docs/docs and /docs/versioned_docs/version-X.Y, where X.Y is the version of the latest minor release.
This can be done in this same PR.

• Yes, this should be backported to the current version of the docs.
• No, the PR only contains docs changes relevant for future versions.

[github-actions]

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