docs: clarify Antigravity MCP setup for VS Code extension (#2855)

Clarifies MCP server configuration when using the Antigravity extension
in VS Code versus standalone Antigravity IDE and VS Code Copilot.

Fixes #2830.

docs/client-configurations.md

@@ -19,7 +19,7 @@ amp mcp add chrome-devtools -- npx chrome-devtools-mcp@latest
 
 To use the Chrome DevTools MCP server follow the instructions from <a href="https://antigravity.google/docs/mcp">Antigravity's docs</a> to install a custom MCP server. Add the following config to the MCP servers config:
 
-```bash
+```json
 {
   "mcpServers": {
     "chrome-devtools": {
@@ -38,6 +38,8 @@ This will make the Chrome DevTools MCP server automatically connect to the brows
 
 Chrome DevTools MCP will not start the browser instance automatically using this approach because the Chrome DevTools MCP server connects to Antigravity's built-in browser. If the browser is not already running, you have to start it first by clicking the Chrome icon at the top right corner.
 
+If you are using the Antigravity extension in VS Code (instead of standalone Antigravity IDE), configure the server in Antigravity's MCP configuration (`mcp_config.json`) rather than VS Code's Copilot settings. If you do not have a browser running with remote debugging on port 9222, omit `--browser-url` to let Chrome DevTools MCP launch Chrome automatically.
+
 </details>
 
 <details>