docs: fix github npx usage example

src/github/README.md

@@ -257,10 +257,10 @@ To use this with Claude Desktop, add the following to your `claude_desktop_confi
       "args": [
         "-y",
         "@modelcontextprotocol/server-github"
-      ]
-    },
-    "env": {
-      "GITHUB_PERSONAL_ACCESS_TOKEN": "<YOUR_TOKEN>"
+      ],
+      "env": {
+         "GITHUB_PERSONAL_ACCESS_TOKEN": "<YOUR_TOKEN>"
+      }
     }
   }
 }