docs: update cli-service.md (vuejs#2037) [ci skip]

Alex-Sokolov · yyx990803 · commit e3ba60fbf574 · 2018-08-05T22:28:43.000-04:00
diff --git a/docs/guide/cli-service.md b/docs/guide/cli-service.md
@@ -52,7 +52,7 @@ Options:
   --https   use https (default: false)
 ```
 
-The `serve` command starts a dev server (based on [webpack-dev-server](https://github.com/webpack/webpack-dev-server)) that comes with Hot-Module-Replacement (HMR) working out of the box.
+The `vue-cli-service serve` command starts a dev server (based on [webpack-dev-server](https://github.com/webpack/webpack-dev-server)) that comes with Hot-Module-Replacement (HMR) working out of the box.
 
 In addition to the command line flags, you can also configure the dev server using the [devServer](../config/#devserver) field in `vue.config.js`.
 
