Clarify what level of php.ini settings can be set via FPM pools

[AllenJB]

From manual page: https://php.net/configuration.changes.modes

FPM pool configuration allows modification of ini settings ( https://www.php.net/manual/en/install.fpm.configuration.php#example-70 ), but it's not clearly stated what level of settings this applies to.

The same applies to settings passed using fastcgi params (from nginx.conf)

(Is php-fpm pool configuration on the same level as httpd.conf, or .htaccess / .user.ini?)