fix incorrect doc for inotify_read

[taka-oyama]

#2599 attempted to improve the doc for inotify_read but the return type is incorrect (returns an inotify event but should return array of inotify events) and threw an error in our code.
This attempts to fix that.

Here is the snippet of our code.
https://phpstan.org/r/bb53cbfc-68cb-44d7-aed8-7efbd7438651

[ondrejmirtes]

Thank you.

[thg2k]

I'm deeply sorry about that. Unfortunately at the same time I was submitting this change I also stumbled upon phpstan/phpstan#8296 and I did not notice this trivial mistake. I just realised that by-ref parameters are not checked, and I was passing the inotify_read result to a function mangling the record, together with param-out.