docs: replace "Auto Routing (Legacy)" with auto-routing

Author: kenjis

user_guide_src/source/incoming/filters.rst

@@ -67,7 +67,7 @@ Configuring Filters
 Once you've created your filters, you need to configure when they get run. This is done in **app/Config/Filters.php**.
 This file contains four properties that allow you to configure exactly when the filters run.
 
-.. Note:: The safest way to apply filters is to :ref:`disable Auto Routing (Legacy) <use-defined-routes-only>`, and :ref:`set filters to routes <applying-filters>`.
+.. Note:: The safest way to apply filters is to :ref:`disable auto-routing <use-defined-routes-only>`, and :ref:`set filters to routes <applying-filters>`.
 
 .. Warning:: It is recommended that you should always add ``*`` at the end of a URI in the filter settings.
     Because a controller method might be accessible by different URLs than you think.