Updated Version 8: Migration guide (markdown)

Version-8:-Migration-guide.md

@@ -26,7 +26,9 @@ This page provides a detailed list of changes and migration guide for Fluent UI
 
 We've provided a number of codemods to help make picking up name and API changes easier.
 
-(Usage details to be added soon)
+Run `npx @fluentui/codemods` to automatically upgrade your repo! This will result in changes being made to files so be sure to run it separate from an other active changes that you have.
+
+Rest of the documentation [here](https://github.com/microsoft/fluentui/wiki/Codemods)
 
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