Update core-code-style.md

docs/internals/core-code-style.md

@@ -196,7 +196,7 @@ $sql = "SELECT *"
 
 ### 5.3 arrays
 
-For arrays we're using PHP 5.3 short array syntax.
+For arrays we're using PHP 5.4 short array syntax.
 
 #### Numerically indexed