Enhancement: Explicitly mentioned that the callback must not have any type of error handling

From manual page: https://php.net/function.spl-autoload-register

It seems that I'm not the first one creating a silly sideeffect by adding a error handling into the autoloader when the class can't be loaded.
see e.g. https://stackoverflow.com/questions/15054993/php-autoload-with-exception-handling-waste-of-time

So it is maybe a good enhancement especially for beginners to mention that the callback to register must not raise a throwable if the class could not be loaded because of missing file. Thus would prevent other programmers to repeat this since it is general best pratice to throw an exception if something doesn't is as expected, which would also be the case if the class to autoload does not exist.

Start with the SPL autoload register manual page linked in the issue and review the callback requirements around failed class loading. Update the English documentation to clarify that the callback must not raise a throwable when a class cannot be loaded because its file is missing, then verify the page renders correctly.