docs: update sv add command for renamed ai-tools add-on

The sv CLI add-on was renamed from `mcp` to `ai-tools` in sveltejs/cli#1050.

documentation/docs/20-instructions/10-instructions.md

@@ -4,7 +4,7 @@ title: AGENTS.md
 
 To get the most out of the [MCP server](mcp) and [skills](skills) we recommend including the following prompt in your [`AGENTS.md`](https://agents.md) (or [`CLAUDE.md`](https://docs.claude.com/en/docs/claude-code/memory#claude-md-imports) or [`GEMINI.md`](https://geminicli.com/docs/cli/gemini-md/), if using Claude Code or Gemini). This will tell your agent which tools are available and when it is appropriate to use them.
 
-> [!NOTE] This is already setup for you when using `npx sv add mcp`
+> [!NOTE] This is already setup for you when using `npx sv add ai-tools`
 
 <!-- prettier-ignore-start -->
 ````markdown