docs(skills): note the install-rules alias carries the same RC caveat

Author: D-K-P

docs/mcp-agent-rules.mdx

@@ -24,7 +24,7 @@ npx trigger.dev@latest skills
   stable release, run it with the `@rc` tag: `npx trigger.dev@rc skills`.
 </Warning>
 
-`npx trigger.dev@latest install-rules` still works as an alias, and `trigger dev` offers to install the skills on first run.
+`npx trigger.dev@latest install-rules` still works as an alias for `skills` (so the same `@rc` caveat applies for now), and `trigger dev` offers to install the skills on first run.
 
 The old task and realtime guidance now lives in the `trigger-authoring-tasks` and `trigger-realtime-and-frontend` skills, alongside two new skills for building `chat.agent` AI agents. See [Skills](/skills) for the full list and supported assistants.