fix: fix minor bugs

Author: hirale

app/code/core/Mage/Api2/Model/Auth/Adapter/Oauth2.php

@@ -52,7 +52,7 @@ public function getUserParams(Mage_Api2_Model_Request $request)
      * Validate the OAuth2 token
      *
      * @param Mage_Api2_Model_Request $request
-     * @return Mage_Oauth2_Model_Token
+     * @return Mage_Oauth2_Model_AccessToken
      * @throws Exception
      */
     protected function _validateToken(Mage_Api2_Model_Request $request)

app/code/core/Mage/Oauth2/Helper/Data.php

@@ -17,7 +17,6 @@ public function generateClientSecret($length = 40)
     /**
      * Generate a token
      *
-     * @param string $clientId The client ID
      * @param int $length The length of the token (default: 40)
      * @return string The generated token
      * @throws Exception if unable to generate random bytes

app/code/core/Mage/Oauth2/Model/AccessToken.php

@@ -13,7 +13,7 @@ protected function _construct()
     /**
      * Get user type associated with the token
      *
-     * @return string
+     * @return string|null
      * @throws Mage_Core_Exception
      */
     public function getUserType()