added some docs to shut PhpStorm up

src/pocketmine/PocketMine.php

@@ -410,6 +410,12 @@ namespace pocketmine {
 		return -1;
 	}
 
+	/**
+	 * @param int        $start
+	 * @param array|null $trace
+	 *
+	 * @return array
+	 */
 	function getTrace($start = 0, $trace = null){
 		if($trace === null){
 			if(function_exists("xdebug_get_function_stack")){

src/pocketmine/Server.php

@@ -2156,6 +2156,10 @@ class Server{
 		}
 	}
 
+	/**
+	 * @param \Throwable $e
+	 * @param array|null $trace
+	 */
 	public function exceptionHandler(\Throwable $e, $trace = null){
 		if($e === null){
 			return;

src/pocketmine/utils/MainLogger.php

@@ -119,6 +119,10 @@ class MainLogger extends \AttachableThreadedLogger{
 		$this->logDebug = $logDebug;
 	}
 
+	/**
+	 * @param \Throwable $e
+	 * @param array|null $trace
+	 */
 	public function logException(\Throwable $e, $trace = null){
 		if($trace === null){
 			$trace = $e->getTrace();