update

docs/intro-docs.mdx

@@ -14,20 +14,16 @@ Or **try Docusaurus immediately** with **[new.docusaurus.io](https://new.docusau
 
 ## 代码块
 
-
-
-
 import Tabs from '@theme/Tabs';
 import TabItem from '@theme/TabItem';
 
 <Tabs
-defaultValue="js"
-values={[
-{ label: 'JavaScript', value: 'js', },
-{ label: 'Python', value: 'py', },
-{ label: 'Java', value: 'java', },
-]
-}>
+  defaultValue="js"
+  values={[
+    { label: 'JavaScript', value: 'js' },
+    { label: 'Python', value: 'py' },
+    { label: 'Java', value: 'java' },
+  ]}>
 <TabItem value="js">
 
 ```js
@@ -95,18 +91,18 @@ https://katex.org/ .
 
 
 **Fundamental Theorem of Calculus**  
-Let $f:[a,b] \to \R$ be Riemann integrable. Let $F:[a,b]\to\R$ be $F(x)=
+Let $f:[a,b] \to \mathbb{R}$ be Riemann integrable. Let $F:[a,b]\to\mathbb{R}$ be $F(x)=
 \int_{a}^{x}f(t)dt$.
-Then $$F$$ is continuous, and at all $x$ such that $f$ is continuous at $x$,
+Then $F$ is continuous, and at all $x$ such that $f$ is continuous at $x$,
 $F$ is differentiable at $x$ with $F'(x)=f(x)$.
 
 ### 科学公式 TeX(KaTeX)
 
 $$E=mc^2$$
 
-行内的公式$$E=mc^2$$行内的公式，行内的$$E=mc^2$$公式。
+行内的公式$E=mc^2$行内的公式，行内的$E=mc^2$公式。
 
-$$\(\sqrt{3x-1}+(1+x)^2\)$$
+$$\sqrt{3x-1}+(1+x)^2$$
 
 $$\sin(\alpha)^{\theta}=\sum_{i=0}^{n}(x^i + \cos(f))$$