minor #15624 Update copy-files.rst (jorluiseptor)

This PR was submitted for the 5.3 branch but it was merged into the 4.4 branch instead.

Discussion
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Update copy-files.rst

I believe the documentation is wrong. Webpack copies the images into build/images, not build/.

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Commits
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68c76e5 Update copy-files.rst

Author: javiereguiluz

frontend/encore/copy-files.rst

@@ -63,11 +63,11 @@ To render inside Twig, use the ``asset()`` function:
 
 .. code-block:: html+twig
 
-    {# assets/images/logo.png was copied to public/build/logo.png #}
-    <img src="{{ asset('build/logo.png') }}" alt="ACME logo">
+    {# assets/images/logo.png was copied to public/build/images/logo.png #}
+    <img src="{{ asset('build/images/logo.png') }}" alt="ACME logo">
 
-    {# assets/images/subdir/logo.png was copied to public/build/subdir/logo.png #}
-    <img src="{{ asset('build/subdir/logo.png') }}" alt="ACME logo">
+    {# assets/images/subdir/logo.png was copied to public/build/images/subdir/logo.png #}
+    <img src="{{ asset('build/images/subdir/logo.png') }}" alt="ACME logo">
 
 Make sure you've enabled the :ref:`json_manifest_path <load-manifest-files>` option,
 which tells the ``asset()`` function to read the final paths from the ``manifest.json``