chore: Update release instructions

Author: Techassi

rust/stackablectl/RELEASE.md

@@ -6,10 +6,12 @@ to be done:
 1. Ensure your local `main` branch is up-to-date and then proceed to checkout a new branch using
    `git checkout -b chore/release-stackablectl-X.Y.Z`.
 2. Update both the Cargo.toml and CHANGELOG.md file to the new version `X.Y.Z`.
-3. Update various files by running the following xtask `cargo xtask gen-man` and
+3. Add the relevant changes from the changelog to a new release notes partial under
+   `docs/stackablectl/partials/release-notes`.
+4. Update various files by running the following xtask `cargo xtask gen-man` and
    `make regenerate-nix`. This is also automatically done if pre-commit is enabled.
-4. Push the changes and raise a PR.
-5. Merge the PR onto `main` and then proceed to tag the appropriate commit using
+5. Push the changes and raise a PR.
+6. Merge the PR onto `main` and then proceed to tag the appropriate commit using
    `git tag -s stackablectl-Y.Y.Z -m stackablectl-Y.Y.Z`.
-6. Building the artifacts and creating the release on GitHub is fully automated from this point
+7. Building the artifacts and creating the release on GitHub is fully automated from this point
    onward.