optimize swoole timer docs

[NathanFreeman]

No description provided.

[lacatoire]

Thanks for working on these docs! One thing about the method set: in current swoole-src, the Swoole\Timer class method table (swoole_timer.cc) registers tick, after, exists, info, stats, list, clear, clearAll, but no set, so set.xml seems to document a method that no longer exists (looks like it was removed). Could you confirm? If it was dropped, the page probably shouldn't be added (or should carry a "removed as of ..." note).

Conversely, Swoole\Timer::exists(int $timer_id): bool is a real method but isn't documented anywhere, so it might be worth adding while we're here.

[NathanFreeman]

Got it, thanks! I'll take a look this week or next. This is my first time contributing to the PHP documentation, so I'm still not very familiar with some parts. I'll make further improvements based on your feedback.

[NathanFreeman]

Swoole\Timer::set has actually been deprecated. I'll check the version history to determine when it was removed.