add missing backslash

Author: g3c0d3r5

src/Contracts/DataTableScope.php

@@ -7,7 +7,7 @@ interface DataTableScope
     /**
      * Apply a query scope.
      *
-     * @param  \Illuminate\Database\Query\Builder|\Illuminate\Database\Eloquent\Builder|\Illuminate\Database\Eloquent\Relations\Relation|Illuminate\Support\Collection  $query
+     * @param  \Illuminate\Database\Query\Builder|\Illuminate\Database\Eloquent\Builder|\Illuminate\Database\Eloquent\Relations\Relation|\Illuminate\Support\Collection  $query
      * @return mixed
      */
     public function apply($query);