[php-src] Issue #23006: Document title for phpcredits() shows phpinfo()

Issue: https://github.com/php/php-src/issues/23006
Author: itzekban

### Description

The following code:

```php
phpcredits();
<?php
```

Resulted in this output:
```
Output uses the title (displayed using html <title> tag) as phpinfo()
```

But I expected this output instead:
```
Output should use phpcredits() as title
```


### PHP Version

```plain
PHP 8.4.23
```

### Operating System

_No response_