docs(mobile/4): fix the shared() #[On] listener example

[simonhamp]

Follow-up to #446.

The shared() example on the Async Tasks page is wrong. It takes a single $event argument and reads $event->result, but #[On] methods get payload keys bound to their parameter names. The shared() payload has id, result and status keys and no event key, so a screen that copies the example breaks as soon as the task finishes. We hit this testing the super-native demo.

This changes the example to bind $result and $status by name, spells out which keys the success and failure payloads carry, and adds a short aside on why every parameter needs a default.

The aside doesn't name the exception on purpose. It was an ArgumentCountError when we found this, and it's a BindingResolutionException on mobile-air main now that #[On] calls go through ComponentMethodInvoker.

The matching test coverage is in NativePHP/mobile-air#484.

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