install_with_ddev.md: Update port args

Flag --http-port has been deprecated, --http-port is a deprecated alias for `--router-http-port`
Flag --https-port has been deprecated, --https-port is a deprecated alias for `--router-https-port`

Author: adriendupuis

docs/getting_started/install_with_ddev.md

@@ -103,7 +103,7 @@ By default, DDEV uses ports 80 and 443.
 You can [set different ports](https://ddev.readthedocs.io/en/latest/users/usage/troubleshooting/#method-2-fix-port-conflicts-by-configuring-your-project-to-use-different-ports) with a command like the following:
 
 ```bash
-ddev config --http-port=8080 --https-port=8443
+ddev config --router-http-port=8080 --router-https-port=8443
 ```
 
 ### 3. Start DDEV