[PHP-NOTES] note 130533 added to function.openssl-csr-new

When using `openssl_csr_new()` or `openssl_csr_sign()` for X25519 or Ed25519 certs, you have to set the `["digest_alg" => ""]` or if you use the `"config"` option to `null`, like so:

<?php
// Setting the "digest_alg" option:
$csr = openssl_csr_new(
	$distinguished_names,
	$private_key,
	["digest_alg" => ""]
);

// Setting with "config":
$csr = openssl_csr_new(
	$distinguished_names,
	$private_key,
	["config" => "/path/to/openssl.conf"]
);
?>

openssl.conf
```
[req]
default_md = null
// ...
```
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