changelog: inform about regression fix breaking related 2.x tasks (#16985)

See #16805

CHANGELOG.md

@@ -13,7 +13,8 @@ Ansible Changes By Release
   - ansible_date_time.iso8601 (changed to UTC instead of local time)
   - ansible_distribution (now uses OS caption string, e.g.: "Microsoft Windows Server 2012 R2 Standard", version is still available on ansible_distribution_version)
   - ansible_totalmem (renamed to ansible_memtotal_mb, units changed to MB instead of bytes)
-- Added the ability to specify serial batches as a list (`serial: [1, 5, 10]`), which allows for so-called "canary" actions in one play.
+* Added the ability to specify serial batches as a list (`serial: [1, 5, 10]`), which allows for so-called "canary" actions in one play.
+* Fixed 'local type' plugins and actions to have a more predictable relative path. Fixes a regression of 1.9 (PR #16805). Existing users of 2.x will need to adjust related tasks.
 
 ####New Modules:
 - archive