docs: remove unneeded section title

kenjis · kenjis · commit f5f1e5e99f89 · 2024-02-24T10:08:47.000+09:00
diff --git a/user_guide_src/source/installation/upgrade_446.rst b/user_guide_src/source/installation/upgrade_446.rst
@@ -12,10 +12,6 @@ Please refer to the upgrade instructions corresponding to your installation meth
     :local:
     :depth: 2
 
-**********************
-Mandatory File Changes
-**********************
-
 ****************
 Breaking Changes
 ****************
