minor #18689 [AssetMapper] Mark component as non experimental (alexandre-daubois)

This PR was merged into the 6.4 branch.

Discussion
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[AssetMapper] Mark component as non experimental

Fix #18685

Commits
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4c537e7 [AssetMapper] Mark component as non experimental

Author: javiereguiluz

frontend/asset_mapper.rst

@@ -3,9 +3,7 @@ AssetMapper: Simple, Modern CSS & JS Management
 
 .. versionadded:: 6.3
 
-    The AssetMapper component was introduced as an
-    :doc:`experimental feature </contributing/code/experimental>` in
-    Symfony 6.3.
+    The AssetMapper component was introduced in Symfony 6.3.
 
 The AssetMapper component lets you write modern JavaScript and CSS without the complexity
 of using a bundler. Browsers *already* support many modern JavaScript features