Match docblock to defined param name.

The mismatch triggers symfonys debug class loader with:

```
  1x: The "Vfs\Node\Factory\NodeFactory::buildFileLink()" method will require a new "FileInterface $file" argument in the next major version of its interface "Vfs\Node\Factory\NodeFactoryInterface", not defining it is deprecated.
    1x in BundleManagerTest::setUp from App\Tests\Unit\Console
```

src/Node/Factory/NodeFactoryInterface.php

@@ -35,7 +35,7 @@ interface NodeFactoryInterface
     public function buildFile($content = '');
 
     /**
-     * @param  FileInterface $file
+     * @param  FileInterface $target
      * @return LinkInterface
      */
     public function buildFileLink(FileInterface $target);