Add clarifications to CCA docs (#57219)

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

Author: 3 people

content/copilot/how-tos/use-copilot-agents/coding-agent/customize-the-agent-environment.md

@@ -98,6 +98,8 @@ In your `copilot-setup-steps.yml` file, you can only customize the following set
 
 For more information on these options, see [AUTOTITLE](/actions/writing-workflows/workflow-syntax-for-github-actions#jobs).
 
+Any value that is set for the `fetch-depth` option of the `actions/checkout` action will be overridden to allow the agent to rollback commits upon request, while mitigating security risks. For more information, see [`actions/checkout/README.md`](https://github.com/actions/checkout/blob/main/README.md).
+
 Your `copilot-setup-steps.yml` file will automatically be run as a normal {% data variables.product.prodname_actions %} workflow when changes are made, so you can see if it runs successfully. This will show alongside other checks in a pull request where you create or modify the file.
 
 Once you have merged the yml file into your default branch, you can manually run the workflow from the repository's **Actions** tab at any time to check that everything works as expected. For more information, see [AUTOTITLE](/actions/managing-workflow-runs-and-deployments/managing-workflow-runs/manually-running-a-workflow).

content/copilot/how-tos/use-copilot-agents/coding-agent/troubleshoot-coding-agent.md

@@ -106,6 +106,10 @@ If {% data variables.product.prodname_copilot_short %} tries to make a request w
 
 For more information, see [AUTOTITLE](/copilot/customizing-copilot/customizing-or-disabling-the-firewall-for-copilot-coding-agent).
 
+## {% data variables.product.prodname_copilot_short %} is not picking up attached screenshots
+
+The maximum image size allowed by {% data variables.copilot.copilot_coding_agent %} is 3.00 MiB. Images larger than this will be removed from the request.
+
 ## Further reading
 
 * [AUTOTITLE](/copilot/tutorials/coding-agent/best-practices)