Fix some coding guideline things.

classes/event/course_module_instance_list_viewed.php

@@ -43,7 +43,7 @@ class course_module_instance_list_viewed extends \core\event\course_module_insta
         $params = array(
             'context' => \context_course::instance($course->id)
         );
-        $event = \mod_attendance\event\course_module_instance_list_viewed::create($params);
+        $event = self::create($params);
         $event->add_record_snapshot('course', $course);
         return $event;
     }

index.php

@@ -54,7 +54,7 @@ if (! $atts = get_all_instances_in_course("attendance", $course)) {
 
 $usesections = course_format_uses_sections($course->format);
 
-// Print the list of instances,
+// Print the list of instances.
 
 $timenow = time();
 $strname  = get_string("name");
@@ -71,7 +71,7 @@ if ($usesections) {
 }
 
 foreach ($atts as $att) {
-    //get the responses of each feedback
+    // Get the responses of each attendance.
     $viewurl = new moodle_url('/mod/attendance/view.php', array('id' => $att->coursemodule));
 
     $dimmedclass = $att->visible ? '' : 'class="dimmed"';