docs: link to MCP guide from upgrade (#85308)

Author: icyJoseph

docs/01-app/02-guides/upgrading/version-16.mdx

@@ -51,6 +51,8 @@ Connect to your coding agent and then prompt:
 Next Devtools, migrate my Next.js app to cache components
 ```
 
+Learn more in the documentation [here](/docs/app/guides/mcp).
+
 ### Using the Codemod
 
 To update to Next.js version 16, you can use the `upgrade` [codemod](/docs/app/guides/upgrading/codemods#160):