Fix PHP-CS-Fixer detected errors

plugin/buycourses/src/buy_course_plugin.class.php

@@ -1025,7 +1025,7 @@ class BuyCoursesPlugin extends Plugin
     }
 
     /**
-     * Get registered item data.by duration.
+     * Get registered item data by duration.
      *
      * @param int $duration The subscription duration
      *
@@ -1194,8 +1194,8 @@ class BuyCoursesPlugin extends Plugin
      *
      * It can return the number of rows when $typeResult is 'count'.
      *
-     * @param int    $start
-     * @param int    $end
+     * @param int    $start           Pagination start.
+     * @param int    $end             Pagination end.
      * @param string $name            Optional. The name filter.
      * @param string $typeResult      Optional. 'all', 'first' or 'count'.
      * @param int    $sessionCategory Optional. Session category id