fix heading

Author: ethanpalm

code.mdx

@@ -17,7 +17,7 @@ To denote a `word` or `phrase` as code, enclose it in backticks (\`).
 To denote a `word` or `phrase` as code, enclose it in backticks (`).
 ```
 
-### Code block
+### Code blocks
 
 Use [fenced code blocks](https://www.markdownguide.org/extended-syntax/#fenced-code-blocks) by enclosing code in three backticks. Specify the programming language for syntax highlighting and to enable meta options. Add any meta options after the language.