[ticket/16955] Fix most return types in phpdoc

PHPBB3-16955

phpBB/phpbb/cron/task/core/prune_all_forums.php

@@ -46,7 +46,7 @@ class prune_all_forums extends \phpbb\cron\task\base
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{

phpBB/phpbb/cron/task/core/prune_forum.php

@@ -66,7 +66,7 @@ class prune_forum extends \phpbb\cron\task\base implements \phpbb\cron\task\para
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{
@@ -137,7 +137,7 @@ class prune_forum extends \phpbb\cron\task\base implements \phpbb\cron\task\para
 	*
 	* @param \phpbb\request\request_interface $request Request object.
 	*
-	* @return null
+	* @return void
 	*/
 	public function parse_parameters(\phpbb\request\request_interface $request)
 	{

phpBB/phpbb/cron/task/core/queue.php

@@ -42,7 +42,7 @@ class queue extends \phpbb\cron\task\base
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{

phpBB/phpbb/cron/task/core/tidy_cache.php

@@ -36,7 +36,7 @@ class tidy_cache extends \phpbb\cron\task\base
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{

phpBB/phpbb/cron/task/core/tidy_database.php

@@ -39,7 +39,7 @@ class tidy_database extends \phpbb\cron\task\base
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{

phpBB/phpbb/cron/task/core/tidy_search.php

@@ -59,7 +59,7 @@ class tidy_search extends base
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{

phpBB/phpbb/cron/task/core/tidy_sessions.php

@@ -36,7 +36,7 @@ class tidy_sessions extends \phpbb\cron\task\base
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{

phpBB/phpbb/cron/task/core/tidy_warnings.php

@@ -41,7 +41,7 @@ class tidy_warnings extends \phpbb\cron\task\base
 	/**
 	* Runs this cron task.
 	*
-	* @return null
+	* @return void
 	*/
 	public function run()
 	{