docs: fix npm command in releases.md

PR-URL: https://github.com/nodejs/node/pull/4656
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/releases.md

@@ -254,7 +254,7 @@ Your release should be available at <https://nodejs.org/dist/vx.y.z/> and <https
 
 There is an automatic build that is kicked off when you promote new builds, so within a few minutes nodejs.org will be listing your new version as the latest release. However, the blog post is not yet fully automatic.
 
-Create a new blog post by running the [nodejs.org release-post.js script](https://github.com/nodejs/nodejs.org/blob/master/scripts/release-post.js). This script will use the promoted builds and changelog to generate the post. Run `npm serve` to preview the post locally before pushing to the [nodejs.org](https://github.com/nodejs/nodejs.org) repo.
+Create a new blog post by running the [nodejs.org release-post.js script](https://github.com/nodejs/nodejs.org/blob/master/scripts/release-post.js). This script will use the promoted builds and changelog to generate the post. Run `npm run serve` to preview the post locally before pushing to the [nodejs.org](https://github.com/nodejs/nodejs.org) repo.
 
 * You can add a short blurb just under the main heading if you want to say something important, otherwise the text should be publication ready.
 * The links to the download files won't be complete unless you waited for the ARMv6 builds. Any downloads that are missing will have `*Coming soon*` next to them. It's your responsibility to manually update these later when you have the outstanding builds.