Add release note

Author: rifelpet

docs/releases/1.33-NOTES.md

@@ -32,7 +32,7 @@ This is a document to gather the release notes prior to the release.
 
 ## Other breaking changes
 
-* TODO
+* Legacy addons have been removed from the kOps repo. These were only referenced by kOps <1.22 ([17322](https://github.com/kubernetes/kops/pull/17332))
 
 # Known Issues