Update frontend/asset_mapper.rst

Co-authored-by: Oskar Stark <oskarstark@googlemail.com>

Author: alamirault

frontend/asset_mapper.rst

@@ -682,7 +682,7 @@ when the :doc:`WebLink Component </web_link>` is available.
 
 .. versionadded:: 6.4
 
-    The feature to automatically preload CSS files when WebLink is available was
+    Automatic preloading of CSS files when WebLink is available was
     introduced in Symfony 6.4.
 
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