ask AI to explain code blocks (#821)

Author: ethanpalm

code.mdx

@@ -19,7 +19,9 @@ To denote a `word` or `phrase` as code, enclose it in backticks (`).
 
 ### 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, like a title or icon, after the language.
+Use [fenced code blocks](https://www.markdownguide.org/extended-syntax/#fenced-code-blocks) by enclosing code in three backticks. Code blocks are copyable, and if you have the assistant enabled, users can ask AI to explain the code.
+
+Specify the programming language for syntax highlighting and to enable meta options. Add any meta options, like a title or icon, after the language.
 
 ```java HelloWorld.java lines icon="java"
 class HelloWorld {