docs: remix serve PORT

docs/other-api/serve.md

@@ -1,6 +1,5 @@
 ---
 title: "@remix-run/serve"
-toc: false
 order: 3
 ---
 
@@ -12,6 +11,24 @@ Remix is designed for you to own your server, but if you don't want to set one u
 remix-serve <server-build-path>
 ```
 
+## `PORT` environment variable
+
+You can change the port of the server with an environment variable.
+
+```sh
+PORT=4000 npx remix-serve <server-build-path>
+```
+
+## `HOST` environment variable
+
+You can configure the hostname for your Express app via `process.env.HOST` and that value will be passed to the internal [`app.listen`][express-listen] method when starting the server.
+
+```sh
+HOST=127.0.0.1 npx remix-serve build/
+```
+
+## Development Environment
+
 Depending on `process.env.NODE_ENV`, the server will boot in development or production mode.
 
 The `server-build-path` needs to point to the `serverBuildDirectory` defined in `remix.config.js`.
@@ -59,14 +76,6 @@ In development, `remix-serve` will ensure the latest code is run by purging the
 
 In production this doesn't happen. The server boots up and that's the end of it.
 
-## `HOST` environment variable
-
-You can configure the hostname for your Express app via `process.env.HOST` and that value will be passed to the internal [`app.listen`][express-listen] method when starting the server.
-
-```sh
-HOST=127.0.0.1 npx remix-serve build/
-```
-
 [remix-run-express]: adapter#createrequesthandler
 [remember]: ./dev-v2#keeping-in-memory-server-state-across-rebuilds
 [express-listen]: https://expressjs.com/en/api.html#app.listen