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1ddf3f3a - Improve information about group offloading and layerwise casting (#11101)

Improve information about group offloading and layerwise casting (#11101) * update * Update docs/source/en/optimization/memory.md * Apply suggestions from code review Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com> * apply review suggestions * update --------- Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>