docs: make PHPDoc more accurate

Author: kenjis

system/HTTP/ResponseTrait.php

@@ -543,7 +543,7 @@ public function redirect(string $uri, string $method = 'auto', ?int $code = null
      * @param string              $expire   Cookie expiration time in seconds
      * @param string              $domain   Cookie domain (e.g.: '.yourdomain.com')
      * @param string              $path     Cookie path (default: '/')
-     * @param string              $prefix   Cookie name prefix
+     * @param string              $prefix   Cookie name prefix ('': the default prefix)
      * @param bool                $secure   Whether to only transfer cookies via SSL
      * @param bool                $httponly Whether only make the cookie accessible via HTTP (no javascript)
      * @param string|null         $samesite
@@ -618,6 +618,9 @@ public function hasCookie(string $name, ?string $value = null, string $prefix =
     /**
      * Returns the cookie
      *
+     * @param string $prefix Cookie prefix.
+     *                       '': the default prefix
+     *
      * @return Cookie|Cookie[]|null
      */
     public function getCookie(?string $name = null, string $prefix = '')

system/Helpers/cookie_helper.php

@@ -28,7 +28,7 @@
      * @param string       $expire   The number of seconds until expiration
      * @param string       $domain   For site-wide cookie. Usually: .yourdomain.com
      * @param string       $path     The cookie path
-     * @param string       $prefix   The cookie prefix
+     * @param string       $prefix   The cookie prefix ('': the default prefix)
      * @param bool         $secure   True makes the cookie secure
      * @param bool         $httpOnly True makes the cookie accessible via http(s) only (no javascript)
      * @param string|null  $sameSite The cookie SameSite value