curl_multi_init: fix return description

ref.: php/doc-en#2591

Author: voku

curl/curl.php

@@ -2594,7 +2594,7 @@ function curl_close(#[LanguageLevelTypeAware(['8.0' => 'CurlHandle'], default: '
 /**
  * Returns a new cURL multi handle
  * @link https://php.net/manual/en/function.curl-multi-init.php
- * @return resource|CurlMultiHandle|false a cURL multi handle resource on success, false on failure.
+ * @return resource|CurlMultiHandle a cURL multi handle resource or object depends on the php version
  */
 #[LanguageLevelTypeAware(['8.0' => 'CurlMultiHandle'], default: 'resource')]
 function curl_multi_init(): CurlMultiHandle {}