docs: add back line in publishing release

See #5732 (comment)

Author: jsjoeio

docs/MAINTAINING.md

@@ -141,7 +141,7 @@ changelog](https://github.com/emacs-mirror/emacs/blob/master/etc/NEWS).
 
 ### Publishing a release
 
-1. Create a new branch called `release`
+1. Create a new branch called `release/v0.0.0` (replace 0s with actual version aka v4.5.0)
 1. Run `yarn release:prep`
 1. Bump chart version in `Chart.yaml`.
 1. Summarize the major changes in the `CHANGELOG.md`