docs/internals/core-code-style.md - removed a duplicated block [ci skip]

docs/internals/core-code-style.md

@@ -146,15 +146,6 @@ class Foo
 
 - All PHP types and values should be used lowercase. That includes `true`, `false`, `null` and `array`.
 
-Use the following format for associative arrays:
-
-```php
-$config = [
-    'name'  => 'Yii',
-    'options' => ['usePHP' => true],
-];
-```
-
 Changing type of an existing variable is considered as a bad practice. Try not to write such code unless it is really necessary.