[fix] type hints and incorrect case in class reference

Author: Marcel Hauri

app/code/Magento/Webapi/Controller/Soap/Request/Handler.php

@@ -107,7 +107,7 @@ public function __construct(
      *
      * @param string $operation
      * @param array $arguments
-     * @return \stdClass|null
+     * @return array
      * @throws WebapiException
      * @throws \LogicException
      * @throws AuthorizationException

app/code/Magento/Webapi/Model/Plugin/GuestAuthorization.php

@@ -19,7 +19,7 @@ class GuestAuthorization
      * Check if resource for which access is needed has anonymous permissions defined in webapi config.
      *
      * @param \Magento\Framework\Authorization $subject
-     * @param callable $proceed
+     * @param \Closure $proceed
      * @param string $resource
      * @param string $privilege
      * @return bool true If resource permission is anonymous,

app/code/Magento/Webapi/Model/Soap/Server.php

@@ -31,7 +31,7 @@ class Server
     const REQUEST_PARAM_LIST_WSDL = 'wsdl_list';
 
     /**
-     * @var \Magento\Framework\App\AreaLIst
+     * @var \Magento\Framework\App\AreaList
      */
     protected $_areaList;