minor #19162 Typo (ThomasLandauer)

This PR was merged into the 6.3 branch.

Discussion
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Typo

Page: https://symfony.com/doc/current/frontend/asset_mapper.html#config-importmap-polyfill

Commits
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c692372 Typo

Author: OskarStark

frontend/asset_mapper.rst

@@ -969,7 +969,7 @@ pages. To add a CSS file to a specific page, create the file, then add a
     {% endblock %}
 
 For JavaScript, first create the new file (e.g. ``assets/checkout.js``). Then,
-add a ``script``` tag that imports it:
+add a ``script`` tag that imports it:
 
 .. code-block:: html+twig