minor #3096 [StimulusBundle] Add missing closing brace in AssetMapper 6.3 example (quentinRogeret34)

This PR was merged into the 2.x branch.

Discussion
----------

 [StimulusBundle] Add missing closing brace in AssetMapper 6.3 example

| Q              | A
| -------------- | ---
| Bug fix?       | no
| New feature?   | no
| Deprecations?  | no
| Documentation? | yes
| Issues         | <!-- none -->
| License        | MIT

---

This PR fixes a typo in the documentation.

Changed:

```twig
For AssetMapper 6.3 only, you also need a ``{{ ux_controller_link_tags() }`
```
to

```twig
For AssetMapper 6.3 only, you also need a ``{{ ux_controller_link_tags() }}``
```

Commits
-------

bfdd0f9 Fix typo in documentation

Author: Kocal

src/StimulusBundle/doc/index.rst

@@ -418,7 +418,7 @@ is running in debug mode.
 
 .. tip::
 
-    For AssetMapper 6.3 only, you also need a ``{{ ux_controller_link_tags() }``
+    For AssetMapper 6.3 only, you also need a ``{{ ux_controller_link_tags() }}``
     in ``base.html.twig``. This is not needed in AssetMapper 6.4+.
 
 With WebpackEncoreBundle