nit: grammar (mainmatter#70)

Author: rithvik-bosch

book/src/06_ticket_management/02_vec.md

@@ -66,7 +66,7 @@ assert_eq!(numbers.get(0), Some(&1));
 assert_eq!(numbers.get(3), None);
 ```
 
-Access is bounds-checked, just element access with arrays. It has O(1) complexity.
+Access is bounds-checked, just like element access with arrays. It has O(1) complexity.
 
 ## Memory layout