minor #2065 [DX] mention documentation in README (alexislefebvre)

This PR was merged into the 2.x branch.

Discussion
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[DX] mention documentation in README

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Issues        | -
| License       | MIT

As a developer, I want to find the documentation for each package as fast as possible.

Commits
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f370094 README: mention documentation

Author: kbond

README.md

@@ -22,7 +22,7 @@ or with [Webpack Encore](https://github.com/symfony/webpack-encore)
 ## Resources
 
 -   [Install Symfony UX](https://symfony.com/doc/current/frontend/ux.html).
--   [List of UX Packages](https://symfony.com/bundles/StimulusBundle/current/index.html#the-ux-packages).
+-   [List of UX Packages and their documentation](https://symfony.com/bundles/StimulusBundle/current/index.html#the-ux-packages).
 -   [Symfony UX Official Demo](https://ux.symfony.com).
 -   Watch the [Stimulus Screencast on SymfonyCasts](https://symfonycasts.com/screencast/stimulus).