Fix some phpdoc

app/Job/HttpAsyncJob.php

@@ -34,7 +34,6 @@ class HttpAsyncJob extends BaseJob
      * @param string $url
      * @param string $content
      * @param array  $headers
-     * @return $this
      */
     public function execute($method, $url, $content, array $headers)
     {

app/Job/ProjectFileEventJob.php

@@ -30,7 +30,6 @@ class ProjectFileEventJob extends BaseJob
      *
      * @param  int    $fileId
      * @param  string $eventName
-     * @return $this
      */
     public function execute($fileId, $eventName)
     {

app/Job/SubtaskEventJob.php

@@ -32,7 +32,6 @@ class SubtaskEventJob extends BaseJob
      * @param  int    $subtaskId
      * @param  string $eventName
      * @param  array  $values
-     * @return $this
      */
     public function execute($subtaskId, $eventName, array $values = array())
     {

app/Job/TaskEventJob.php

@@ -38,7 +38,6 @@ class TaskEventJob extends BaseJob
      * @param  array  $changes
      * @param  array  $values
      * @param  array  $task
-     * @return $this
      */
     public function execute($taskId, array $eventNames, array $changes = array(), array $values = array(), array $task = array())
     {

app/Job/TaskFileEventJob.php

@@ -30,7 +30,6 @@ class TaskFileEventJob extends BaseJob
      *
      * @param  int    $fileId
      * @param  string $eventName
-     * @return $this
      */
     public function execute($fileId, $eventName)
     {

app/Job/TaskLinkEventJob.php

@@ -30,7 +30,6 @@ class TaskLinkEventJob extends BaseJob
      *
      * @param  int    $taskLinkId
      * @param  string $eventName
-     * @return $this
      */
     public function execute($taskLinkId, $eventName)
     {