Apply suggestion from @OrKoN

Author: OrKoN

README.md

@@ -207,7 +207,7 @@ Install the Chrome DevTools MCP server using the Gemini CLI.
 ```bash
 # Either MCP only:
 gemini mcp add chrome-devtools npx chrome-devtools-mcp@latest
-# Or as Gemini extension (MCP+Skills):
+# Or as a Gemini extension (MCP+Skills):
 gemini extensions install --auto-update https://github.com/ChromeDevTools/chrome-devtools-mcp
 ```