docs: add details

Author: kenjis

user_guide_src/source/helpers/cookie_helper.rst

@@ -28,7 +28,7 @@ The following functions are available:
     :param    int    $expire: Number of seconds until expiration
     :param    string    $domain: Cookie domain (usually: .yourdomain.com)
     :param    string    $path: Cookie path
-    :param    string    $prefix: Cookie name prefix
+    :param    string    $prefix: Cookie name prefix. If ``''``, the default from **app/Config/Cookie.php** is used
     :param    bool    $secure: Whether to only send the cookie through HTTPS
     :param    bool    $httpOnly: Whether to hide the cookie from JavaScript
     :param    string    $sameSite: The value for the SameSite cookie parameter. If ``null``, the default from **app/Config/Cookie.php** is used

user_guide_src/source/outgoing/response.rst

@@ -367,7 +367,7 @@ The methods provided by the parent class that are available are:
         :param int $expire: Cookie expiration time in seconds
         :param string $domain: Cookie domain
         :param string $path: Cookie path
-        :param string $prefix: Cookie name prefix
+        :param string $prefix: Cookie name prefix. If set to ``''``, the default value from **app/Config/Cookie.php** will be used
         :param bool $secure: Whether to only transfer the cookie through HTTPS
         :param bool $httponly: Whether to only make the cookie accessible for HTTP requests (no JavaScript)
         :param string $samesite: The value for the SameSite cookie parameter. If set to ``''``, no SameSite attribute will be set on the cookie. If set to ``null``, the default value from **app/Config/Cookie.php** will be used