doc: mention --newVersion release script

PR-URL: https://github.com/nodejs/node/pull/61255
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruy Adorno <ruy@vlt.sh>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>

doc/contributing/releases.md

@@ -325,7 +325,12 @@ git node release -S --prepare --security --filterLabel v20.x
 ```
 
 to automate the remaining steps until step 6 or you can perform it manually
-following the below steps.
+following the below steps. For semver-minors, you can pass the new version
+explicitly with `--newVersion` arg:
+
+```bash
+git node release -S --prepare --security --filterLabel v20.x --newVersion 20.20.0
+```
 
 <details>
 <summary>Security release</summary>