CLOUDP-327516: Fix post install docs (#2418)

Author: josvazg

docs/dev/release.md

@@ -240,23 +240,6 @@ release version.
 
 # Post Release actions
 
-Following the instructions above the release is completed, but the AKO repo is left using a `helm-charts/` submodule which is not pointing to the latest released Helm Chart. Make a PR to update that submodule:
-```
-cd helm-charts
-git pull
-```
-Checkout to the branch for the release:
-```
-git checkout mongodb-atlas-kubernetes-<VERSION>
-```
-Return up to the AKO repo, and create a new branch & PR with the newer submodule:
-```
-cd ..
-git checkout -b update-helm-submodule-<VERSION>
-git add helm-charts
-git push
-```
-
 If the release is a new minor version, then the CLI must be updated with the new version (and any new CRDs) [here](https://github.com/mongodb/atlas-cli-plugin-kubernetes/blob/main/internal/kubernetes/operator/features/crds.go).
 
 If necessary, a CLI plugin release can be created as detailed [here](https://github.com/mongodb/atlas-cli-plugin-kubernetes/blob/main/RELEASING.md).