[Bug] file_exists, is_readable and is_writable do not use stat cache

[ohyeaah]

Affected page

https://www.php.net/manual/en/function.file-exists.php
https://www.php.net/manual/en/function.is-readable.php
https://www.php.net/manual/en/function.is-writable.php

Issue description

In the notes section of all three links it says the function is using stat cache but it isn't.
When you run on Linux:

strace php --run "echo is_dir('moh123');" 2>&1 | grep moh123
strace php --run "echo file_exists('moh123');" 2>&1 | grep moh123

You will see that is_dir uses newfstatat syscall which indicates that it's using stat cache.
While file_exists uses access syscall which indicates it's not using stat cache.

Steps to reproduce

1. Create a file called moh123
2. Run the test script

<?php
while (true)
{
   echo file_exists("moh123") ? 1 : 0;
   sleep(1);
}

3. Delete file moh123 and you will see that the output changes (because it's not cached).

Suggested fix

Remove stat cache note.

I'm using Debian and PHP 8.2.28

[ohyeaah]

Same for is_executable