Admin manual - parameter formatting enabledPreviewProviders

The Admin manual (i had a look only for NC14) descripts the parameter “enabledPreviewProviders”.

'enabledPreviewProviders' => array(
        'OC\Preview\PNG',
        'OC\Preview\JPEG',
        'OC\Preview\GIF',
        'OC\Preview\BMP',
        'OC\Preview\XBitmap',
        'OC\Preview\MP3',
        'OC\Preview\TXT',
        'OC\Preview\MarkDown'
),

It that single backslash syntax correct? Or shouldn’t it be double slash like this:

array (
  0 => 'OC\\Preview\\PNG',
  1 => 'OC\\Preview\\JPEG',
  2 => 'OC\\Preview\\GIF',
  3 => 'OC\\Preview\\BMP',
  4 => 'OC\\Preview\\XBitmap',
  5 => 'OC\\Preview\\MP3',
  6 => 'OC\\Preview\\TXT',
  7 => 'OC\\Preview\\MarkDown',
),