[AssetMapper] Removing orphaned footnote [2]

Page: https://symfony.com/doc/6.4/frontend.html

frontend.rst

@@ -37,7 +37,7 @@ Supports TypeScript :ref:`yes <asset-mapper-ts>` yes
 Removes comments from JavaScript no yes
 Removes comments from CSS no no
 Versioned assets always optional
-Can update 3rd party packages yes no :ref:`[3] <ux-note-3>`
+Can update 3rd party packages yes no :ref:`[2] <ux-note-2>`
 ================================ ================================== ==========
 
 .. _ux-note-1:
@@ -49,11 +49,7 @@ be executed by a browser.
 
 .. _ux-note-2:
 
-**[2]** There are some `PostCSS`_ plugins available to remove comments from CSS files.
-
-.. _ux-note-3:
-
-**[3]** If you use ``npm``, there are update checkers available (e.g. ``npm-check``).
+**[2]** If you use ``npm``, there are update checkers available (e.g. ``npm-check``).
 
 .. _frontend-asset-mapper: