wpt_custom_login_url.php

<?php

$login_url = add_filter( 'wpto_login_url', 'smyles_custom_login_url');

function smyles_custom_login_url( $login_url ){
	// This will append /custom-login/ to you main site URL as configured in general settings (ie https://domain.com/custom-login/)
	$login_url = "https://wooproducttable.com/documentation/";
	return $login_url;
}