Added phpdoc_separation fixer

The idea here is to go from:

```php
    /**
     * @param EngineInterface $templating
     * @return void
     */
```

to 

```php
    /**
     * @param EngineInterface $templating
     *
     * @return void
     */
```
Maybe add that functionallity into Utils, I saw recently we need that in few places.
Please, add a simple, dummy method and tests for that method to cover all cases, then, at the evening, I can send solution for it.
(Writing from work)