add example to description of base-url parameter

Author: robandpdx

action.yml

@@ -30,7 +30,7 @@ inputs:
     description: A comma separated list of status codes that will NOT be retried e.g. "400,500". No effect unless `retries` is set
     default: 400,401,403,404,422 # from https://github.com/octokit/plugin-retry.js/blob/9a2443746c350b3beedec35cf26e197ea318a261/src/index.ts#L14
   base-url:
-    description: An optional GitHub REST API URL to connect to a different GitHub instance.
+    description: An optional GitHub REST API URL to connect to a different GitHub instance. For example, https://my.github-enterprise-server.com/api/v3
     required: false
 outputs:
   result: