[UX] Add description to attributes and their parameters

[smnandre]

There is an ongoing work started by @GromNaN to add documentation on attribute classes + parameters across Symfony codebase.

Here's what it would like in symfony/ux

• [ ] Symfony\UX\Autocomplete\Form\AsEntityAutocompleteField
• [x] Symfony\UX\LiveComponent\Attribute\AsLiveComponent - https://github.com/symfony/ux/pull/1378
• [x] Symfony\UX\LiveComponent\Attribute\LiveAction - https://github.com/symfony/ux/pull/1378
• [x] Symfony\UX\LiveComponent\Attribute\LiveArg - https://github.com/symfony/ux/pull/1378
• [x] Symfony\UX\LiveComponent\Attribute\LiveListener - https://github.com/symfony/ux/pull/1378
• [x] Symfony\UX\LiveComponent\Attribute\LiveProp - https://github.com/symfony/ux/pull/1378
• [x] Symfony\UX\LiveComponent\Attribute\PostHydrate - https://github.com/symfony/ux/pull/1378
• [x] Symfony\UX\LiveComponent\Attribute\PreDehydrate - https://github.com/symfony/ux/pull/1378
• [x] Symfony\UX\LiveComponent\Attribute\PreReRender - https://github.com/symfony/ux/pull/1378
• [ ] Symfony\UX\Turbo\Attribute\Broadcast
• [x] Symfony\UX\TwigComponent\Attribute\AsTwigComponent - https://github.com/symfony/ux/pull/1229
• [x] Symfony\UX\TwigComponent\Attribute\ExposeInTemplate
• [x] Symfony\UX\TwigComponent\Attribute\PostMount - https://github.com/symfony/ux/pull/1229
• [x] Symfony\UX\TwigComponent\Attribute\PreMount - https://github.com/symfony/ux/pull/1229

(some are already well documented)

Meta-issue: https://github.com/symfony/symfony/issues/51920

[weaverryan]

Great idea! If you're reading this, please feel free to grab an attribute, describe it a bit, and open a PR. We can help during review with any phrasing - so it doesn't need to be perfect.

[smnandre]

I started one (https://github.com/symfony/ux/pull/1229), please tell me if that's going in the good direction (style, content..) and i'll continue :)