doc: update git node land instructions for security releases

Signed-off-by: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: aduh95

doc/contributing/releases.md

@@ -272,11 +272,12 @@ $ git reset --hard upstream/vN.x
 The list of patches to include should be listed in the "Next Security Release"
 issue in `nodejs-private`. Ask the security release steward if you're unsure.
 
-The `git node land` tool does not work with the `nodejs-private`
-organization. To land a PR in Node.js private, use `git cherry-pick` to apply
-each commit from the PR. You will also need to manually apply the PR
-metadata (`PR-URL`, `Reviewed-by`, etc.) by amending the commit messages. If
+To use the `git node land` tool to land Pull Requests in the `nodejs-private`
+organization, you need to specify the full URL to the Pull Request and make sure
+you provide a GitHub token with read permission to the private repository. If
 known, additionally include `CVE-ID: CVE-XXXX-XXXXX` in the commit metadata.
+Make sure to sign and push to resulting commit to the private repository and not
+the public one.
 
 **Note**: Do not run CI on the PRs in `nodejs-private` until CI is locked down.
 You can integrate the PRs into the proposal without running full CI.