docs: add a reading to week 2 flash attention#100
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Connor1996 merged 1 commit intoskyzh:mainfrom Feb 25, 2026
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Added From Online Softmax to FlashAttention to the Readings section in
book/src/week2-04-flash-attention.md.This note derives the FlashAttention recurrence from Online Softmax step by step, making Algorithm 1 in the original paper significantly easier to understand.