MDL-30315 grades: Fix up function doc block.

This was annoying me no end so here is a commit
to set it right.

grade/import/lib.php

@@ -37,9 +37,10 @@ function get_new_importcode() {
  * (grade_import_value and grade_import_newitem)
  * If this function is called, we assume that all data collected
  * up to this point is fine and we can go ahead and commit
- * @param int courseid - id of the course
- * @param string importcode - import batch identifier
- * @param feedback print feedback and continue button
+ * @param int $courseid - ID of the course.
+ * @param int $importcode - Import batch identifier.
+ * @param bool $importfeedback - Whether to import feedback as well.
+ * @param bool $verbose - Print feedback and continue button.
  * @return bool success
  */
 function grade_import_commit($courseid, $importcode, $importfeedback=true, $verbose=true) {