🍱 docs: change the codeblock example

content/markdown.md

@@ -9,13 +9,7 @@ tags = ["markdown", "test"]
 
 ```rust
 fn main() {
-    let number: u8 = 4;
-
-    match number {
-        i if i == 0 => println!("Zero"),
-        i if i  > 0 => println!("Greater than zero")
-        i if i <= 0 => println!("Smaller or equal to zero"),
-    }
+        println!("Hello, world!") -> ();
 }
 ```
 ## Quote