fix: add missing semicolon (#135)

Co-authored-by: Jason Hsien-Chueh Hsieh <[email protected]>

Author: jason-hchsieh

src/safe-guides/coding_practice/variables/P.VAR.02.md

@@ -15,7 +15,7 @@ let data = {
     let mut data = get_vec();
     data.sort();
     data 
-}
+};
 
 //  `data` 在后面不会再被改变
 ```