MDL-30999 grade: updated Grade API phpdocs

mod/assignment/grade.php

@@ -1,4 +1,30 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Redirect the user to the appropriate submission related page within /mod/assignment
+ *
+ * Based on the supplied parameters and the user's capabilities the user will be redirected
+ * to either their own submission, a particular student's submission or a summary of all submissions
+ *
+ * @package   mod_assignment
+ * @category  grade
+ * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 require_once("../../config.php");
 
@@ -29,4 +55,4 @@ if (has_capability('mod/assignment:grade', get_context_instance(CONTEXT_MODULE,
 } else {
     // user will view his own submission, parameter $userid is ignored
     redirect('view.php?id='.$cm->id);
-}
+}