Add example to configure the GitHub MCP in CCA with wider access (#58151)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: nhu-do

content/copilot/how-tos/use-copilot-agents/coding-agent/extend-coding-agent-with-mcp.md

@@ -325,7 +325,23 @@ If you want to allow {% data variables.product.prodname_copilot_short %} to acce
 {% data reusables.repositories.navigate-to-repo %}
 {% data reusables.repositories.sidebar-settings %}
 1. In the "Code & automation" section of the sidebar, click **{% data variables.product.prodname_copilot_short %}** then **{% data variables.copilot.copilot_coding_agent_short_cap_c %}**.
-1. Add your configuration in the **MCP configuration** section.
+1. Add your configuration in the **MCP configuration** section. For example, you can add the following:
+
+  ```javascript copy
+    // If you copy and paste this example, you will need to remove the comments prefixed with `//`, which are not valid JSON.
+    {
+      "mcpServers": {
+        "github-mcp-server": {
+          "type": "http",
+          // Remove "/readonly" to enable wider access to all tools.
+          // Then, use the "tools" key to specify the subset of tools you'd like to include.
+          "url": "https://api.githubcopilot.com/mcp/readonly",
+          "tools": ["*"]
+        }
+      }
+    }
+   ```
+
 1. Click **Save**.
 {% data reusables.actions.sidebar-environment %}
 1. Click the `copilot` environment.