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4ac2b4a5 - [docs] polish caching docs. (#12684)

[docs] polish caching docs. (#12684) * polish caching docs. * Update docs/source/en/optimization/cache.md Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com> * Update docs/source/en/optimization/cache.md Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com> * up --------- Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>