fix typo in an equation

fix a typo in the post

_posts/2023-10-23-flashattention.md

@@ -148,7 +148,7 @@ $$
 
 $$
 m(x^{(1)})=3 \; \; f(x^{(1)})=[e^{-2},1] \; \; l(x^{(1)})=(e^{-2}+1) \; \; f(x^{(1)})=[\frac{e^{-2}}{e^{-2}+1}, \frac{1}{e^{-2}+1}] \\
-m(x^{(2)})=4 \; \; f(x^{(1)})=[e^{-2},1] \; \; l(x^{(2)})=(e^{-2}+1) \; \; f(x^{(2)})=[\frac{e^{-2}}{e^{-2}+1}, \frac{1}{e^{-2}+1}]
+m(x^{(2)})=4 \; \; f(x^{(2)})=[e^{-2},1] \; \; l(x^{(2)})=(e^{-2}+1) \; \; f(x^{(2)})=[\frac{e^{-2}}{e^{-2}+1}, \frac{1}{e^{-2}+1}]
 $$
 
 接下来我们根据上面的结果计算前两个块的结果：