docs: increase TOC depth

kenjis · kenjis · commit c959c8b98501 · 2022-10-22T13:29:06.000+09:00
diff --git a/user_guide_src/source/changelogs/v4.3.0.rst b/user_guide_src/source/changelogs/v4.3.0.rst
@@ -7,7 +7,7 @@ Release Date: Unreleased
 
 .. contents::
     :local:
-    :depth: 2
+    :depth: 3
 
 Highlights
 **********
