Documentation about how to create a fully customised CacheManager is missing

I see this in the README "See the complete docs for more info." but I don't see a link to the complete docs?

Start in the README at the sentence “See the complete docs for more info.” and inspect the surrounding CacheManager documentation. Add a link to the complete documentation covering fully customised CacheManager creation, then verify the link resolves and the referenced guidance is present.

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