docs: add PHPDoc comments

Author: kenjis

app/Config/CURLRequest.php

@@ -13,6 +13,9 @@ class CURLRequest extends BaseConfig
      *
      * Whether share options between requests or not.
      *
+     * If true, all the options won't be reset between requests.
+     * It may cause an error request with unnecessary headers.
+     *
      * @var bool
      */
     public $shareOptions = true;

system/HTTP/CURLRequest.php

@@ -81,7 +81,7 @@ class CURLRequest extends Request
     protected $delay = 0.0;
 
     /**
-     * Default options. Applied to all requests.
+     * The default options from the constructor. Applied to all requests.
      *
      * @var array
      */
@@ -90,6 +90,9 @@ class CURLRequest extends Request
     /**
      * Whether share options between requests or not.
      *
+     * If true, all the options won't be reset between requests.
+     * It may cause an error request with unnecessary headers.
+     *
      * @var bool
      */
     private $shareOptions;
@@ -149,6 +152,9 @@ public function request($method, string $url, array $options = []): ResponseInte
         return $this->response;
     }
 
+    /**
+     * Reset all options to default.
+     */
     protected function resetOptions()
     {
         // Reset headers