Revise Copilot information in how-to.md

Updated Copilot references and added review note.

Author: gewarren

docs/standard/serialization/system-text-json/how-to.md

@@ -120,7 +120,7 @@ The object contains the following fields: FirstName (string), Lastname (string),
 Provide example output.
 ```
 
-GitHub Copilot is powered by AI, so surprises and mistakes are possible. For more information, see [Copilot FAQs](https://aka.ms/copilot-general-use-faqs).
+Review Copilot's suggestions before applying them. For more information GitHub Copilot, see GitHub's [FAQs](https://github.com/features/copilot#faq).
 
 ## See also