docs: correct markdown syntax of tutorial (cotes2020#1787)

cotes2020 · web-flow · commit 64ae7a367133 · 2024-05-30T03:33:35.000+08:00
diff --git a/_posts/2019-08-08-write-a-new-post.md b/_posts/2019-08-08-write-a-new-post.md
@@ -433,8 +433,6 @@ If you want to display the **Liquid** snippet, surround the liquid code with `{%
 
 Or adding `render_with_liquid: false` (Requires Jekyll 4.0 or higher) to the post's YAML block.
 
-```
-
 ## Mathematics
 
 We use [**MathJax**][mathjax] to generate mathematics. For website performance reasons, the mathematical feature won't be loaded by default. But it can be enabled by:
