Update demo.md

KevinLikesCodingMC · KevinLikesCodingMC · commit 3049a1978449 · 2024-05-17T20:22:09.000+08:00
diff --git a/notebooks/demo.md b/notebooks/demo.md
@@ -23,7 +23,7 @@ $$ e^{i\pi}=-1 $$
 
 $$ Math = 114514 $$
 
- $$\varphi$$ and $$\mu$$
+ $\varphi$ and $\mu$
 
  | 19  | 19  |
 | ------------ | ------------ |
