[Recipe][Docs] Add MXFP4 intermediate variable and scheduler delay advice for Kimi-K2

[benenzhu]

Added environment variable for MXFP4 intermediate processing and recommended scheduler delay factor for large concs.

• AITER_MXFP4_INTERMEDIATE=1 added in [RadeonFlow] MXFP4 (a4w4) MoE backend for gfx950 aiter#3832 can makes moe gemm2 output directly out fp4 output, which can be then consumed directly by AITER_QUICK_REDUCE_QUANTIZATION=INT4

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• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[github-actions]

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