Apply doc suggestions from code review

Co-authored-by: Victor Skvortsov <vds003@gmail.com>

Author: Nadine-H

examples/plugins/example_plugin_server/README.md

@@ -17,7 +17,7 @@ If you wish to hook up your own plugin server through `dstack` builtin `rest_plu
     fastapi dev app/main.py 
     ```
 
-1. Enable `rest-plugin` in `dstack` `server/config.yaml`:
+1. Enable `rest_plugin` in `server/config.yaml`:
 
     ```yaml
    plugins: