minor #12975 Fixed typo (fbastien)

This PR was merged into the 4.3 branch.

Discussion
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Fixed typo

Commits
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23b9c31 Fixed typo

Author: javiereguiluz

reference/twig_reference.rst

@@ -98,7 +98,7 @@ asset
 Returns the public path of the given asset path (which can be a CSS file, a
 JavaScript file, an image path, etc.). This function takes into account where
 the application is installed (e.g. in case the project is accessed in a host
-subirectory) and the optional asset package base path.
+subdirectory) and the optional asset package base path.
 
 Symfony provides various cache busting implementations via the
 :ref:`reference-framework-assets-version`, :ref:`reference-assets-version-strategy`,