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

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

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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.