Bamboo 5.9 API Changes by Version information is incomplete and out of sight

The Bamboo API Changes by Version are an important and helpful resource for add-on vendors conceptually.

Unfortunately, other than say the Changes for 5.7, the Changes for 5.9 lack any notion of deprecated methods for example, and at least one meanwhile surfaced as a fairly nasty bug (see BAM-16054).

Could you please update this document accordingly and add other possibly still undocumented API changes too, if any?

Also, the 'Changes for 5.9' page is erroneously sorted below all older versions within Bamboo API Changes by Version, thus easy to miss at first sight.