Removed some weirdly formatted comments

[fballiano]

I found these weird comments in the source code:

/**#@-*/

I couldn't find where they come from or what's the meaning.

[elidrissidev]

Probably an ancient syntax for region folding, like for example you can do the following in VSCode to create a foldable code block with massactions as its title:

//region massactions
/**
 * Current massactions
 * @var string
 */
public const ASSIGN_GROUP              = 'assign_group';
public const ATTRIBUTES                = 'attributes';
public const CANCEL_ORDER              = 'cancel_order';
public const CHANGE_MODE               = 'change_mode';
// more values...
//endregion