docs: fix incorrect logs path in MCP troubleshooting

Author: ammar-agent

docs/mcp-servers.mdx

@@ -66,4 +66,4 @@ If a server fails to start:
 
 1. **Test the command manually** — Run the command in your terminal to verify it works
 2. **Check dependencies** — Ensure required packages are installed (`npx -y` downloads on first run)
-3. **Review logs** — Server errors appear in mux logs (`~/.mux/logs/`)
+3. **Use the Test button** — Settings → Projects shows connection errors inline