minor #2188 [Dropzone] change physical link to the default style file (chadyred)

This PR was merged into the 2.x branch.

Discussion
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[Dropzone] change physical link to the default style file

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

Hello, after installing and following the doc, I have a message with an error on the path to the style file after having copy docs config example :)

Commits
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1e23116 [Dropzone] change physical link to the default style file

Author: smnandre

src/Dropzone/doc/index.rst

@@ -62,7 +62,7 @@ Symfony UX Dropzone provides a default stylesheet in order to ease
 usage. You can disable it to add your own design if you wish.
 
 In ``assets/controllers.json``, disable the default stylesheet by
-switching the ``@symfony/ux-dropzone/src/style.css`` autoimport to
+switching the ``@symfony/ux-dropzone/dist/style.min.css`` autoimport to
 ``false``:
 
 .. code-block:: json
@@ -74,7 +74,7 @@ switching the ``@symfony/ux-dropzone/src/style.css`` autoimport to
                     "enabled": true,
                     "fetch": "eager",
                     "autoimport": {
-                        "@symfony/ux-dropzone/src/style.css": false
+                        "@symfony/ux-dropzone/dist/style.min.css": false
                     }
                 }
             }