docs: v0.13 migration notes

docs/abra/hack.md

@@ -404,11 +404,7 @@ The project with all changes and discussions is [here](XXX).
 
 A huge thanks to all our `abra` hackers for this release 💖
 
-```
-...
-```
-
-$CHANGELOG
+$git_shortlog_output
 ```
 
 #### General announcement text
@@ -442,7 +438,7 @@ We maintain a fork of [godotenv](https://git.coopcloud.tech/toolshed/godotenv) b
 
 ### `docker/cli`
 
-We maintain a fork of [docker-cli](https://git.coopcloud.tech/toolshed/docker-cli/) because we needed to [patch port exposing](https://git.coopcloud.tech/toolshed/docker-cli/commit/2fbb22f65866ac97b47e4d47d8f855fee8c98e2a) to fix this [bug](https://github.com/docker/cli/issues/2407). Once the fix was upstreamed we can remove this fork again.
+We maintain a fork of [docker-cli](https://git.coopcloud.tech/toolshed/docker-cli/) because we needed to [patch port exposing](https://git.coopcloud.tech/toolshed/docker-cli/commit/2fbb22f65866ac97b47e4d47d8f855fee8c98e2a) to fix this [bug](https://github.com/docker/cli/issues/2407). Once the [fix was upstreamed](https://github.com/docker/cli/pull/6799) we can remove this fork again. 
 
 ### `docker/client`
 

docs/abra/upgrade.md

@@ -53,6 +53,15 @@ And test things work.
 
 > General release notes are [here](https://git.coopcloud.tech/toolshed/abra/releases/)
 
+### `0.12.x-beta` -> `0.13.x-beta`
+
+* `abra recipe sync` went away. You now only need to run `upgrade`/`release`.
+  See [`#682`](https://git.coopcloud.tech/toolshed/abra/issues/682) for the
+  design details and
+  [here](/maintainers/handbook/#upstream-released-a-new-version-how-do-i-upgrade-the-recipe)
+  for the revised documentation. Thanks to `@iexos` for getting this out the
+  door!
+
 ### `0.11.x-beta` -> `0.12.x-beta`
 
 * `kadabra` has been archived and is no longer published alongside `abra`