Update PHP docs and stubs for ibase_service_attach()

[mlazdans]

None of parameters are required for embedded. New signature:

/**
 * Connect to the service manager
 * @link https://php.net/manual/en/function.ibase-service-attach.php
 * @param string $host [optional]
 * @param string $dba_username [optional]
 * @param string $dba_password [optional]
 * @return resource|false
 */
function ibase_service_attach($host = null, $dba_username = null, $dba_password = null) {}

[mlazdans]

Stubs: https://github.com/JetBrains/phpstorm-stubs (also used by https://github.com/bmewburn/vscode-intelephense)
Docs: https://www.php.net/manual/en/function.ibase-service-attach.php

[MartinKoeditz]

Good hint. Will update the docs.