docs: add changelog and note

Author: kenjis

user_guide_src/source/changelogs/v4.4.0.rst

@@ -146,6 +146,10 @@ Deprecations
 Bugs Fixed
 **********
 
+- **Auto Routing (Improved)**: In previous versions, when ``$translateURIDashes``
+  is true, two URIs correspond to a single controller method, one URI for dashes
+  (e.g., **foo-bar**) and one URI for underscores (e.g., **foo_bar**). This bug
+  has been fixed. Now the URI for underscores (**foo_bar**) is not accessible.
 - **Output Buffering:** Bug fix with output buffering.
 
 See the repo's

user_guide_src/source/incoming/routing.rst

@@ -577,6 +577,12 @@ URI segments when used in Auto Routing, thus saving you additional route entries
 
 .. literalinclude:: routing/049.php
 
+.. note:: When using Auto Routing (Improved), prior to v4.4.0, if
+    ``$translateURIDashes`` is true, two URIs correspond to a single controller
+    method, one URI for dashes (e.g., **foo-bar**) and one URI for underscores
+    (e.g., **foo_bar**). This was incorrect behavior. Since v4.4.0, the URI for
+    underscores (**foo_bar**) is not accessible.
+
 .. _use-defined-routes-only:
 
 Use Defined Routes Only