2.16 release notes - fix up internal reference (#8525)

docs/releases/2.16.md

@@ -16,7 +16,7 @@ This release adds support for Django 4.0.
 
 ### Slim sidebar
 
-As part of a [wider redesign](https://github.com/wagtail/wagtail/discussions/7739) of Wagtail’s administration interface, we have replaced the sidebar with a slim, keyboard-friendly version. This re-implementation comes with significant accessibility improvements for keyboard and screen reader users, and will enable us to make navigation between views much snappier in the future. Please have a look at [upgrade considerations](#upgrade-considerations) for more details on differences with the previous version.
+As part of a [wider redesign](https://github.com/wagtail/wagtail/discussions/7739) of Wagtail’s administration interface, we have replaced the sidebar with a slim, keyboard-friendly version. This re-implementation comes with significant accessibility improvements for keyboard and screen reader users, and will enable us to make navigation between views much snappier in the future. Please have a look at [upgrade considerations](2.16_upgrade_considerations) for more details on differences with the previous version.
 
 ### Automatic redirect creation
 
@@ -84,7 +84,7 @@ Thank you to [The National Archives](https://www.nationalarchives.gov.uk) for ki
  * Ensure that programmatic page moves are correctly logged as 'move' and not 'reorder' in some cases (Andy Babic)
 
 
-(upgrade-considerations)=
+(2.16_upgrade_considerations)=
 ## Upgrade considerations
 
 ### Removed support for Django 3.0 and 3.1