Update CHANGELOG.md

CHANGELOG.md

@@ -32,13 +32,17 @@ For the full list of changes, see the [0.x.y] release notes.
   base support for RTL][bs-rtl].
 - The URL to your project's contribution guidelines is configurable. For
   details, see [Adding a community page].
+- A warning is now output when a section's sidebar entries are truncated because
+  there are more than [params.ui.sidebar_menu_truncate] section entries.
 
 **Other changes**: TBC
 
 [0.x.y]: https://github.com/google/docsy/releases/latest?FIXME=v0.X.Y
 [bs-rtl]: https://getbootstrap.com/docs/5.3/getting-started/rtl/
 [Adding a community page]:
   https://www.docsy.dev/docs/adding-content/content/#adding-a-community-page
+[params.ui.sidebar_menu_truncate]:
+  https://www.docsy.dev/docs/adding-content/navigation/#section-menu-options
 
 ## 0.10.0